GasSim 2 Supplement 3 for version v.2.00.70
Contents
1. Antimony 7440 36 0 1 00 kg Arsenic 7440 38 2 1 00 kg Beryllium 7440 41 7 1 00 kg Boron 7440 42 8 1 00t Cadmium 7440 43 9 1 00 kg Chromium 7440 47 3 10 00 kg Copper 7440 50 8 10 00 kg Lead 7439 92 1 100 00 kg G ASS Tm 232 Manganese Mercury Nickel Selenium Vanadium Zinc Other substances Brominated diphenylethers penta octa and deca Chlorine and total inorganic compounds as HCI Chlorofluorocarbons CFCs Dioxins and furans PCDDs PCDFs I TEQ Dioxins and furans PCDDs PCDFs WHO TEQ Fluorine and total inorganic compounds as HF Halons Hydrobromofluorocarbons HBFCs Hydrochlorofluorocarbons HCFCs Hydrofluorocarbons HFCs Nitrogen oxides NO and NO2 as NO2 Non methane volatile organic compounds NMVOCs Particulate matter PM2 5 Particulate Matter PM10 Particulate Matter total Perfluorocarbons PFCs Polychlorinated biphenyls PCBs Polychlorinated Biphenyls PCBs as WHO TEQ Sulphur oxides SO2 and SO3 as SO2 Other Enhancements 7439 96 5 7439 97 6 7440 02 0 7782 49 2 7440 62 2 7440 66 6 7782 50 5 EDF 079 7782 41 4 1336 36 3 1336 36 3 10 00 kg 1 00 kg 10 00 kg 100 00 kg 10 00 kg 100 00 kg 10 00 kg 10 00 t 1 00 kg 0 019 0 019 1 00t 1 00 kg 10 00 kg 1 00 kg 100 00 kg 100 00 t 10 00 t 1 00t 1 00t 10 00 t 10 00 kg 100 00 g 0 01 g 100 00 t Various forms have been made resizable and the controls on them are resized repositioned when the form is resized2. for a bulk gas Fix for possible buffer overrun problems in file compression algorithm Fix for bug in lateral migration of trace gases caused by code reading results files expecting data in a different order from code that writes the data Also fix for code that reads lateral trace stats files expecting entries for unselected trace gases and trace gases without dispersivity set in the file Together these bugs meant that the results for lateral migration of trace gases could be unreliable Fix for variance not being the square of the standard deviation in various places where statistics had been added or scaled When no flares no engines is selected nothing is written to the gas plant files when there is bulk gas generated This led to file errors when the statistics were generated The code has been changed to write zeros to the files in the same way that happens when no bulk gas is generated When changing the settings to use a dxf map GasSim would sometimes fail with a runtime error 13 This was a result of not clearing handles that referred to existing objects in the dxf control such as boundaries If these handles happened to be used in the map for a different type of object such as a piece of text it would result in the runtime error 13 This bug might also result in objects disappearing from the map at run time though this would be more difficult to spot This has been fixed by clearing these handles when the contr
3. to take advantage of the space available The Tier 2 run menu has been turned into a drop down menu in order to avoid running AERMOD by mistake The error handling for file operations has been improved This means that the user is now alerted to errors that may occur whereas previously some errors were not detected The new error handling has also highlighted some existing bugs which have been fixed in this release The runtime buffer size used for compressed file streams has been increased from the default 4KB to 64KB which gives a significant performance improvement when running the calculations for models on the local hard disk G ASS Tm
4. 10 00 kg 2 Methoxyethanol 109 86 4 10 00 kg 2 Methoxyethyl acetate 110 49 6 10 00 kg Methyl bromide Bromomethane 74 83 9 100 00 kg 2 Methyl 2 butene 513 35 9 10 00 kg 3 Methyl 1 butene 563 45 1 100 00 kg Methyl chloride Chloromethane 74 87 3 1 00 t Methyl chloroform 1 1 1 Trichloroethane 71 55 6 10 00 kg 4 4 Methylene bis 2 chloroaniline 101 14 4 1 00 kg 4 4 Methylene dianiline 101 77 9 10 00 kg 4 4 Methylenediphenyl diisocyanate 101 68 8 1 00 kg Methyl isocyanate 624 83 9 1 00 kg Mirex 2385 85 5 1 00 kg Naphthalene 91 20 3 100 00 kg Nitrobenzene 98 95 3 10 00 kg 2 Nitropropane 79 46 9 1 00 kg Pentachlorobenzene 608 93 5 1 00 kg Pentachlorophenol 87 86 5 1 00 kg Pentane 109 66 0 100 00 kg Pentene all isomers 25377 72 4 1 00 Phenol 108 95 2 10 00 kg Propylbenzene 103 65 1 10 00 kg Propylene 115 07 1 10 00 t Propylene oxide 75 56 9 100 00 kg Styrene 100 42 5 100 00 kg Tetrachloroethane 1 1 2 2 Tetrachloroethane 79 34 5 10 00 kg Tetrachloroethylene 127 18 4 100 00 kg Tetrafluoroethylene 116 14 3 10 00 kg Toluene 108 88 3 100 00 kg Toluene diisocyanate all isomers 10 00 kg Toxaphene 8001 35 2 1 00 kg Trichlorobenzene all isomers 12002 48 1 1 00 kg Trichloroethylene 79 01 6 1 00 t Trichlorotoluene 98 07 7 10 00 kg Trimellitic anhydride 552 30 7 1 00 kg Trimethylbenzene all isomers 25551 13 7 10 00 kg Vinyl acetate 108 05 4 10 00 kg Vinyl chloride 75 01 4 1 00t Xylene all isomers 1330 20 7 1 00 t Metals and compounds
5. 10 00 kg Diisopropyl ether 108 20 3 10 00 kg Dimethylaniline N N Dimethyl benzeneamine 121 69 7 10 00 kg Dimethyl sulphate 77 78 1 1 00 kg Dimethylformamide 68 12 2 1 00 t Dimethyl o toluidine 609 72 3 10 00 kg Dimethyl p toluidine 99 97 8 10 00 kg Dioxane 123 91 1 10 00 kg Diphenylamine 122 39 4 10 00 kg Endrin 72 20 8 1 00 kg 2 Ethoxyethanol Ethyleneglycol ethylether 110 80 5 10 00 kg 2 Ethoxyethyl acetate Ethyleneglycol ethylether 1 00 kg acetate 111 15 9 Ethyl acrylate 140 88 5 10 00 kg Ethyl benzene 100 41 4 100 00 kg Ethyl bromide Bromoethane 74 96 4 10 00 kg 1 Ethyl 3 5 dimethylbenzene 934 74 7 10 00 kg Ethylene Ethene 74 85 1 1 00t Ethylene dichloride 1 2 Dichloroethane 107 06 2 1 00 t Ethylene oxide 1 2 Epoxyethane 75 21 8 1 00 t Ethyl toluene all isomers 25550 14 5 10 00 kg Fluoranthene 206 44 0 1 00 kg Formaldehyde Methanol 50 00 0 10 00 kg Heptachlor 76 44 8 1 00 kg Hexabromobiphenyl 36355 1 8 100 00 g Hexabromocyclododecane 25637 99 4 10 00 kg Hexachlorobenzene 118 74 1 1 00 kg Hexachlorocyclohexane all isomers 608 73 1 1 00 kg Hexane 110 54 3 10 00 kg 1 Hexene 592 41 6 10 00 kg Indeno 1 2 3 cd pyrene 193 39 5 1 00 kg G ASS Tm 12 lodomethane 74 88 4 10 00 kg Isophorone 78 59 1 10 00 kg Isophorone diisocyanate 4098 71 9 1 00 kg Isoprene 78 79 5 10 00 kg Lindane 58 89 9 1 00 kg Maleic anhydride 108 31 6 10 00 kg Methane 74 82 8 10 00 t Methanol 67 56 1 100 00 kg 2 Methoxyethoxy ethanol 111 77 3
6. 3 6 74E 04 6 74E 04 1 876 05 1 876 05 1 60E 05 1 60E 05 12 6 0 00 1 1 1 2 Tetatluorochtoncethane 5 05603 313 1 1 1 Trohicrotritluoroethane 00165 1 312 Lichicuneth nag no Ozone Depletion Potential Ronnes of ticthorathuosonetiwes NI119YYYda i v Gos inclusion Use Detined X Lok CHa Tota COZ Trace Gaver Tost CH bumed Rt GwP Reduction CO2 CH x Buk LFG Composkon T The options screen is now accessed via an options button rather than appearing before the results screen As the user changes options year of interest trace gas selection etc the percentiles are now recalculated from the raw results data rather than adding up pre calculated percentile figures for individual species as an estimate of figures required The user can select which trace gases to include in the totals manually or choose one of the standard selections IPCC IPCC Montreal DEFRA All or None Selection of the DEFRA option for trace gas inclusion is equivalent to the Default option on previous versions of GasSim The IPCC option allows users to select trace gas components which are appropriate for reporting emissions following the 2006 IPCC Guidelines for National Greenhouse Gas Inventories The IPCC Montreal option adds emissions of trace gases included within the Montreal Protocol and subsequent Amendments to the IPCC guidelines G ASST M 6 The printing of global impact resu
7. SUPPLEMENT 3 GasSim2 Release Version 2 00 0070 1 REVISIONS TO GASSIM2 csssssssssscesessessesesseesseseeseesessessesseeeeneaeeneasesensseaneaseeeesanas 2 Bug CA 2 Improvements to Functionality 2mmmmmnanannanana na nawanaanananawanananaananananasananananananaa 5 Global IMp Gaan NGANGA aa aaao kaen 5 Table 1 Summary of Default GWP and ODP Values s sssssssssssrnsnnnsrinennnnnnnnnnnnnennnas 6 Using the Global Impacts Model ssssssssssssssnsnsnunnunnunnnunnnunuunnnnnnnnnnnnnnnnnnnnnnnnunnnnnnnn 7 New Export Options witii aaaea an aaa eerie 8 PI Reporting Changes aa Aka AA 9 Table 2 PI Reporting ThreSholds cssssssssssssssssscssssssssesessssesssessssasecsssseeeseeneeeeees 10 SOLE CLA PARA HAAAY 13 G ASS Tm 1 REVISIONS TO GASSIM2 This supplement to the GasSim2 manual covers revisions to the model in release version 2 00 0070 The previous version available from the GasSim web site was 2 00 0061 Interim versions 2 00 0062 0065 and 2 00 0067 to 2 00 0069 were internal test versions trialled before releasing this latest version Version 2 00 0066 was sent to a number of customers who were unable to use the earlier version because of the number of cells in their models Revisions are associated with bug fixes identified during the last eleven months and improvements to the functionality of the model Theses improvements include more extensive reporting of Global Impacts new export options and changes to the PI Rep
8. act Results screen appears you can select the year of interest from the drop down list at the top of the screen or select Sum of all years You will see the figures updating as you change your selection You can also select which gases you wish to include in the various totals displayed in the bottom half of the screen To do this simply click on the check boxes in the Include column at the right hand side of the table Again you will see the figures updating as you change your selection of gases An alternative way to select which gases are included is to use the Gas Inclusion drop down list For example if you select IPCC from this list the check boxes in the table will change to include only IPCC gases The percentile on which all the figures are based is indicated in the title bar of the Global Impact Results screen You can change this by clicking on the Options button This will show a screen on which you can select which percentile is used and also allows you to set GWP and ODP values for the three bulk gases carbon dioxide methane and hydrogen G ASST M 34 Global impact Cs CWC a em Be 9 BX Gibal Warming Potential Caton Dineds ftonres i Methane fonnes of carbon donde 75 Hydrogen tonnes of cabon fo dorade Ozone Depletion Potential Caton Diwede onnes of tachdosotlucromethane Methane Jonnas of omethane Hpdrogen tonnes of techiosoluoromethane Tue Gaver The Trace Gases button
9. hanges on the screen This has been fixed so that co ordinates are only rounded for display purposes Furthermore when editing a coordinate the figure was being wiped so that the user had to re enter the whole coordinate It now displays the coordinate being edited to 3 decimal places and the user does not have to retype the whole number Furthermore the area and perimeter lengths displayed are now based on the actual coordinates rather than the rounded versions After deleting waste compositions from a model use of some of the remaining waste compositions would result in a runtime error 9 usually when exiting from the Waste Composition form This has been fixed Spurious large figures sometimes appeared in the Tier 1 results relating to the last year of the simulation though not consistently This has been fixed When determining the correct objective for a given pollutant region averaging period and year in Tier2 GasSim assumed that the records matching the given pollutant region and averaging period were in reverse chronological order However this is not always the case with the current air quality file The code has been changed to choose the most appropriate record regardless of their order In Tier 2 aborting an AERMOD run would sometimes result in the results view and export options being available even though there were no results Using these options would subsequently result in GasSim crashing These options are now di
10. hracene Benzene CAS 7664 41 7 1332 21 4 124 38 9 75 15 0 630 08 0 7647 01 0 74 90 8 10024 97 2 75 44 5 2551 62 4 75 07 0 107 02 8 79 06 1 107 13 1 309 00 2 107 18 6 61 82 5 62 53 3 120 12 7 71 43 2 Threshold 1 00 t 1 00 kg 10 000 00 t 1 00 t 100 00 t 10 00 t 100 00 kg 10 00 t 10 00 kg 10 00 kg 100 00 kg 10 00 kg 10 00 kg 1 00 t 1 00 kg 10 00 kg 1 00 kg 10 00 kg 10 00 kg 1 00 t GASS NM 11 Benzo a pyrene 50 32 8 1 00 kg Benzo b fluoranthene 205 99 2 1 00 kg Benzo g h i perylene 191 24 2 1 00 kg Benzo k fluoranthene 207 08 9 1 00 kg Benzo butyl phthalate BBP 85 68 7 10 00 kg Benzyl chloride 100 44 7 10 00 kg Bromoethene 593 60 2 10 00 kg Butadiene 1 3 Butadiene 106 99 0 100 00 kg Butene all isomers 1 00 t Carbon tetrachloride Tetrachloromethane 56 23 5 10 00 kg Chlordane 57 74 9 1 00 kg Chlordecone 143 50 0 1 00 kg Chlororethane 75 00 3 10 00 kg Chloroform Trichloromethane 67 66 3 100 00 kg Chloroprene 126 99 8 10 00 kg Chrysene 218 01 9 10 00 kg Crotonaldehyde 4170 30 3 10 00 kg Cumene hydroperoxide 80 15 9 10 00 kg Dibutyl phthalate 84 74 2 10 00 kg p Dichlorobenzene 1 4 Dichlorobenzene 106 46 7 1 00 kg Dichlorodiphenyltrichloroethane DDT 50 29 3 1 00 kg Dichloromethane DCM Methylene chloride 75 09 2 1 00 t Dieldrin 60 57 1 1 00 kg Diethyl aniline N N Diethyl benzeneamine 91 66 7 10 00 kg Di 2 ethylhexyl phthalate DEHP 117 81 7 10 00 kg Diethyl ether 60 29 7
11. lts has also been updated and the grid has been changed to allow copying of the data and a copy button has also been added which copies various other fields to the clipboard as well as the values shown in the grid The trace gas screen has been amended to allow copy and paste in the grid The Global Impacts trace gas screen has had a Default button added which allows the user to reset all the GWP and ODP figures to the current default values This is useful for updating these figures in old models 4 Trace Gases Gas 1 1 1 2 T etratlucrochoroethane 11 1 Trohicrotrituoroethane 11 2 Tnchiuosthane 110k hioroethare 110x hcroethere 11 Dichtorotetrathoncethane 1 20khioropropane 1 2 Dichlorotetrathoncethane 1 Chionor1 1 lt difluoncethane Ozone depletion Potentials ODP and Global Warming Potentials GWP of bulk and trace gases have been amended where appropriate using the data provided in the Scientific Assessment of Ozone Depletion 2006 published by the World Meteorological Organisation and the IPCC Fourth Assessment Report Climate Change 2007 Table 1 Summary of Default GWP and ODP Values Global Warming Ozone depletion Name Potential Potential Carbon Dioxide 1 Methane 25 Acetalehyde ethanal 1 3 Acetone 0 5 Bromodichloromethane 1300 1890 Butane 4 Carbon tetrachloride tetrachloromethane 1400 0 73 1 Chloro 1 1 difluoroethane 2310 0 07 Chlorodifluoromethane 1810 0 05 Chloroform trichloromethane 30 Chlorotrifluo
12. new column has been added containing the CAS number of the species Gases not modelled now have a reported value of n a rather than Not Modelled Figures can now be copied from the grid and a new Copy button copies the entire grid to the clipboard so that it can subsequently be pasted into a spreadsheet The grid now resizes when the form is resized by the user G ASST M 4 Pl Reporting Acnlamde 2 Propenarride Acryorinie 2 Propenerd1ie Alden AR alcohol 2 Properr1 of Ambok PAmano1 2 4tnazoke 10 7 000 00 kg 1 00 kg 10 000 NOD OO kg 10 000 NOD OO kg 100 DO kg 100 000 00 kg 10 000 00 kg 100 00 kg 10 000 00 kg 1000kg 1000kg 100 00 kg 1000kg 1000kg 1000 DO kg 1 00 kg 1000 kg 1 00 kg 1000 kg 1000 kg 100 Wkg 1 00 kg 1 00 kg 1 00 kg 1 00 kg 1000 kg 1000 kg 10100 kg 100 00 kg TOO DO kg The printing has been altered to reflect the changes to the grid The current list of PI gases their associated CAS numbers and the reporting thresholds are provided in Table 2 below Table 2 PI Reporting Thresholds Gas Inorganics Ammonia Asbestos Carbon Dioxide Carbon disulphide Carbon monoxide Hydrogen chloride Hydrogen cyanide Nitrous oxide Phosgene Sulphur hexafluoride Organics Acetaldehyde Ethanal Acrolein Acrylamide 2 Propenamide Acrylonitrile 2 Propenenitrile Aldrin Allyl alcohol 2 Propen 1 ol Amitrole 3 Amino 1 2 4 triazole Aniline Benzeneamine Ant
13. ol that displays the graphics is reloaded for example when a dxf map is selected by the user During a simulation GasSim2 was incorrectly using the GasSim registry key rather than the GasSim2 registry key when looking for the composition directory in order to load the H2S DAT file during the calculation when H2S module was included This results in an error if GasSim 1 GasSimLite is not installed or results in the GasSim 1 GasSiml ite file being used This has been fixed Fix for runtime error 6 that occurs if there are duplicate points on the boundary when calculating the nearest point on the boundary This occurs when closing the map in the phase view Fix for various problems with printing of global results when the results don t fit onto a single page mostly with the box lines not being printed properly Also measure the text being printed in columns so that a more appropriate column width can be chosen at run time This avoids long trace gas names overwriting the figures in the next column Previously percentiles were calculated in different ways in the front and back end GasSim2 now uses the same algorithm for both GasSim previously had a hard coded limit of 256 compressed file handles so that you couldn t have more than 256 compressed files open simultaneously This limit can be reached during the gas generation calculation by having about 26 cells the number of flares and engines also affects the exact limit This limit ha
14. on this screen takes you to another screen where you can set GWP and ODP for trace gases 4 Trace Gases 11 Dichtorotetiatuocethane 120k horopropane 120k hiorotehafuocethare 1 Chioror 11 diflumcethane The Default button here reverts these trace gas figures to the defaults for GWP and ODP provided by GasSim see the earlier table for the actual values trace gases not listed will have default GWP and ODP values of zero Once you have made all your selections so that the Global Impact Results screen is displaying the figures you require you can use the Print button to print a report containing these results Or you can use the Copy button to copy the figures to the clipboard so that you can subsequently paste then into a spreadsheet New Export Options The export option on the graphs screen has been split into two export options which allow transposition of the data one year per column or one percentile per column GASS NM 4 Total Total Bulk LFG Produced Fa 95X Less Than FG 90 Less Than fv 75 Lase Than Pi 50 Lare Than W 25 Less Than FG 10 Leve Than fe 5 Less Than i t Export options have also been added to the multi graph screen that work in a similar way to the export options on the graph screen PI Reporting Changes The PI Reporting screen has been improved in several ways The list of the species has been changed to more closely match that expected for current PI Reporting A
15. orting screen Bug Fixes GasSim was designed to allow surcharging by simulating the temporary removal of the cap to add more waste however this functionality had not been fully implemented GasSim now assumes that no cap is present during a year in which the cell s incoming waste PDF is defined to be anything other than Single 0 When printing to MDI Microsoft Office Document Image Writer in landscape mode in Tier 1 screening a run time error 380 occurred This was because the MDI print driver doesn t support landscape mode The code has been changed to give a warning message that the print might not fit and then go ahead with the print in portrait mode When printing to MDI the user can use a custom page size if the printout doesn t fit There was a conservative error in the partitioning of residual gases between lateral and surface emissions This is now modelled as if there is an impenetrable barrier 50m from the site barrier within the cell The gases on the inner side of this notional barrier will only contribute to surface emissions whilst the gases on the outer side of the notional barrier will be partitioned between surface and lateral emissions taking both the permeabilities of the cap and liner and the relative areas into account as described in the User Manual The boundary count for a project was not being initialised properly when a new project was created while an existing project was loaded This resulted in r
16. romethane 14400 Dichlorodifluoromethane 10900 1 Dichlorofluoromethane 210 Dichloromethane methylene chloride 9 1 1 Dichlorotetrafluoroethane 10000 0 94 Ethane 5 5 Ethylene 3 7 Fluorotrichloromethane 4750 1 Freon 113 6130 1 Methyl chloride chloromethane 146 Propane 3 3 1 1 1 2 Tetrafluorochloroethane 609 0 02 Toluene 2 7 Trichlorofluoromethane 4750 1 Trichlorotrifluoroethane 6130 1 1 1 1 Trichlorotrifluoroethane 6130 1 G ASST M Using the Global Impacts Model Once you have run the Source Gases simulation or reloaded the results from an earlier simulation you can enter the Global Impact Results screen by clicking on Global Impact on the main screen or selecting Global Impact on the Simulate menu Before the Global Impact Result Screen appears the raw result data needed for calculating the Global Impacts is loaded into memory This may take a few minutes depending on the size of the model and a progress screen is displayed during this process 4 Global Impact Results 50th percentile hi Gg tono COZ nonner Fone palaka pa 3 2 006 04 4 206 05 0 oo 7 19 03 292 0 6 136 03 6 740 04 6 74E 04 1 876 05 1 876 05 1 606 05 12 6 11 1 2 Tetatluorochionethane 5 05603 11 1 Trehicrotritluoroethane WH 9 Gos Inclusion fu set Delned Lok CHA Toti C02 Trace Gaver Tost Com Engres CHebunedkt f Ophons GWP Reduction t CO2 CH x Suk LFG Composbon M Once the Global Imp
17. s been removed G ASS Tm 4 A bug has been fixed in the gas generation calculation in the back end which resulted in the sum of hydrogen emissions from engines being incorrectly calculated as the sum of methane emissions The text on the unlicence screen contained some control characters which showed up as vertical bars These have been removed When in Landfill Characteristics various sequences of events used to cause GasSim to crash For example selecting the site boundary then right clicking the boundary and clicking details then clicking OK then Clicking on the boundary This was the result of the selected entity being erased and recreated when redrawn leaving the selection list containing entities that no longer existed This has been fixed so that entities are not normally erased during the redraw or if entities do need to be erased they are deselected first GasSim was also crashing if this form was closed while defining a boundary cell flare or engine This has also been fixed as have similar problems with the tier 2 screen The form also occasionally crashed while loading this has also been fixed The boundary details form suffered from a number of problems relating to the vertex coordinates These are displayed to 0 decimal places and this was resulting in the vertices being moved when OK was pressed or in the event of the new positions being invalid an error message This occurred even if the user had not made any c
18. sabled in these circumstances Tier 2 export was not correctly identifying receptor types in the AERMOD results and either didn t export all the requested receptors or gave them incorrect names This has been fixed Tier 1 concentration results for gases from engines and flares for which site specific data was available from the emissions converter were being underestimated when there was more than one flare or more than one engine of a given type This has been fixed G ASS Tm Improvements to Functionality Global Impacts There have been major changes to the Global Impacts screen To support this there have been corresponding changes to the results saved during a simulation and new code to calculate appropriate statistics from this data according to the options selected by the user Various new parameters have been added to aid reporting including the CH4 burnt in engines and flares and the GWP reduction associated with this combustion Bulk LFG composition and the methane generation potential of waste deposited Lo The emissions of carbon dioxide and methane have been subdivided to show the results for surface emissions engine emissions and flare emissions separately In some cases new results files have been generated during the Gas Generation calculation to support this 4 Global Impact Results 50th percentile waa lee og GWP mp ODP hannes panes C02 loenes COGF 2 006 04 4 206 06 0 00 7 196 03 292 0 6 13E 0
19. untime errors 9 subscript out of range in Tier1 and Tier 2 This has been fixed If you load a project which suffers from this problem in the new version of GasSim it will attempt to correct the problem e When simulations were running the screen would sometimes not refresh for considerable lengths of time and the user interface would appear dead Switching out of the application and back was particularly problematic as nothing would appear when you switched back and it would look as though you were still in the other application At other times an unreasonable amount of time was spent writing progress messages to the screen The normal simulation calculation and lateral migration calculation have now been changed to run on a separate thread at a lower priority This fixes the problems described and also makes it more feasible to run GasSim in the background whilst getting on with other work The lateral migration results screen was sometimes generating a runtime error 6 overflow and crashing This was the result of division by zero having taken place during the earlier lateral migration calculation G ASS Tm e and the resulting invalid figures being rejected by the Visual Basic front end when they were to be displayed This happened when there were no bulk gases and has now been fixed Fix for bug in Tier 2 export that results in the error message Export failed under some circumstances usually when exporting results
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