August 2026 - BurnSimAnnouncements - mailman2.blastzone.org

Erosive Burning and Wiki Updates
by greg＠blastzone.org 10 Aug '26

10 Aug '26

Erosive Burning simulation achieved! Note the differences in the 2 screenshots below. One is a standard simulation, with the grain burn profile partially in the burn, the second is the exact same motor but with erosive burning effects simulated, visible by the varied grain consumption closer to the nozzle and the spike in the initial part of the burn data graph. This is now available for download https://burnsim.com/download. 2 models are available, Lenoir-Robillard or Mukunda-Paul. For full details see the wiki page at https://wiki.burnsim.com/index.php?title=Erosive_Burning. Oh yeah, i guess i should mention that the wiki site has been updated! Now the Erosive Version Thanks! Greg Deputy _______________________________________________ BurnSimAnnouncements mailing list -- announcements(a)burnsim.com <mailto:announcements@burnsim.com> To unsubscribe send an email to announcements-leave(a)burnsim.com <mailto:announcements-leave@burnsim.com> List info & management: https://mailman2.blastzone.org/postorius/lists/announcements.burnsim.com Archives: https://mailman2.blastzone.org/hyperkitty/list/announcements.burnsim.com/

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BurnSim 4.0.0.12 release - Axial Motor Cross section and Custom Grain Option
by greg＠blastzone.org 06 Aug '26

06 Aug '26

Well, this is embarrassing! I apologize again for the noise, you may have seen a few messages that appeared empty with an attachment. I had some settings wrong on the new list and it was chewing up the messages. A new version of BurnSim has been released and is ready for download at https://burnsim.com/download. New additions include custom 2D grain profiles drawn in program or imported from DXF or SVG and a new axial cross sectional view of the simulated motor. These are brand new features and I've tested quite a bit on my own, but assume there are still lots of bugs lurking in there. Please let me know anything you see that needs addressing. Version 4.0.0.12 - released 8/5/2026 * Added a Custom grain type: draw or import your own grain cross-section instead of picking a parametric shape. Import from an ASCII DXF, SVG, or raster image (PNG/JPEG/BMP), or build one from scratch in the new shape editor - an outer boundary plus repeatable holes and slots you can drag directly in the preview - and export back to DXF when you're done. This feature is brand new - see the caveats on the Download page * Added an axial (side-on) motor cross-section next to the radial preview, showing the grain stack, case, and nozzle for any grain type, with the same erosion slider animating both. Case/nozzle dimensions beyond throat and exit are estimated rather than modeled * Fixed a rasterization bug inflating a D grain's reported peak Kn by roughly 11% - other grain types were unaffected * Removed the Pie Segment grain type (it's no longer offered when adding a grain); a motor file that already has one still opens and explains what happened, instead of failing with an unrecognized-type error * Grain geometry the simulator can't actually represent (e.g. an oversized finocyl fin) is now flagged directly in the grid instead of silently simulating something else * Grains left with no burning surface (e.g. an end burner with both ends inhibited) are now reported instead of crashing the simulation * Sped up simulations where several grains share the same shape by eroding each distinct shape once instead of once per grain * Fixed New, Open, and Recent Files immediately discarding an unsaved motor instead of asking whether to save it first, the way closing the program already did * Fixed an imported custom grain shape occasionally being silently discarded instead of applied to the grain * Fixed the grain editor's toolbar overlapping the grain grid when the window was narrow Thanks! Greg Deputy

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test again
by greg＠blastzone.org 06 Aug '26

06 Aug '26

More testing.

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test
by greg＠blastzone.org 06 Aug '26

06 Aug '26

Testing to see if list issues are fixed

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BurnSim 4.0.0.12, trying again
by greg＠blastzone.org 05 Aug '26

05 Aug '26

Well, this is embarrassing! I apologize again for the 2 wonky messages, they may have appeared empty with an attachment for most folks. This should work correctly now. Hello BurnSim users, a new version has been released and is ready for download at https://burnsim.com/download. New additions include custom 2D grain profiles drawn in program or imported from DXF or SVG and a new axial cross sectional view of the simulated motor. These are brand new features and I've tested quite a bit on my own, but assume there are still lots of bugs lurking in there. Please let me know anything you see that needs addressing. Version 4.0.0.12 - released 8/5/2026 * Added a Custom grain type: draw or import your own grain cross-section instead of picking a parametric shape. Import from an ASCII DXF, SVG, or raster image (PNG/JPEG/BMP), or build one from scratch in the new shape editor - an outer boundary plus repeatable holes and slots you can drag directly in the preview - and export back to DXF when you're done. This feature is brand new - see the caveats on the Download page * Added an axial (side-on) motor cross-section next to the radial preview, showing the grain stack, case, and nozzle for any grain type, with the same erosion slider animating both. Case/nozzle dimensions beyond throat and exit are estimated rather than modeled * Fixed a rasterization bug inflating a D grain's reported peak Kn by roughly 11% - other grain types were unaffected * Removed the Pie Segment grain type (it's no longer offered when adding a grain); a motor file that already has one still opens and explains what happened, instead of failing with an unrecognized-type error * Grain geometry the simulator can't actually represent (e.g. an oversized finocyl fin) is now flagged directly in the grid instead of silently simulating something else * Grains left with no burning surface (e.g. an end burner with both ends inhibited) are now reported instead of crashing the simulation * Sped up simulations where several grains share the same shape by eroding each distinct shape once instead of once per grain * Fixed New, Open, and Recent Files immediately discarding an unsaved motor instead of asking whether to save it first, the way closing the program already did * Fixed an imported custom grain shape occasionally being silently discarded instead of applied to the grain * Fixed the grain editor's toolbar overlapping the grain grid when the window was narrow Thanks! Greg Deputy

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Re: BurnSim 4.0.0.12 released with Custom Grains and Axial Cross Section View/Animation
by greg＠blastzone.org 05 Aug '26

05 Aug '26

Well, that didn't come across as desired! Sorry folks, new list growing pains.... Trying again: Hello BurnSim users, a new version has been released and is ready for download at https://burnsim.com/download. New additions include custom 2D grain profiles drawn in program or imported from DXF or SVG and a new axial cross sectional view of the simulated motor. These are brand new features and I've tested quite a bit on my own, but assume there are still lots of bugs lurking in there. Please let me know anything you see that needs addressing. Version 4.0.0.12 - released 8/5/2026 * Added a Custom grain type: draw or import your own grain cross-section instead of picking a parametric shape. Import from an ASCII DXF, SVG, or raster image (PNG/JPEG/BMP), or build one from scratch in the new shape editor - an outer boundary plus repeatable holes and slots you can drag directly in the preview - and export back to DXF when you're done. This feature is brand new - see the caveats on the Download page * Added an axial (side-on) motor cross-section next to the radial preview, showing the grain stack, case, and nozzle for any grain type, with the same erosion slider animating both. Case/nozzle dimensions beyond throat and exit are estimated rather than modeled * Fixed a rasterization bug inflating a D grain's reported peak Kn by roughly 11% - other grain types were unaffected * Removed the Pie Segment grain type (it's no longer offered when adding a grain); a motor file that already has one still opens and explains what happened, instead of failing with an unrecognized-type error * Grain geometry the simulator can't actually represent (e.g. an oversized finocyl fin) is now flagged directly in the grid instead of silently simulating something else * Grains left with no burning surface (e.g. an end burner with both ends inhibited) are now reported instead of crashing the simulation * Sped up simulations where several grains share the same shape by eroding each distinct shape once instead of once per grain * Fixed New, Open, and Recent Files immediately discarding an unsaved motor instead of asking whether to save it first, the way closing the program already did * Fixed an imported custom grain shape occasionally being silently discarded instead of applied to the grain * Fixed the grain editor's toolbar overlapping the grain grid when the window was narrow Thanks! Greg Deputy -----Original Message----- From: greg--- via BurnSimAnnouncements <announcements(a)burnsim.com> Sent: Wednesday, August 5, 2026 5:32 PM To: announcements(a)burnsim.com Subject: [BurnsimAnnouncements] BurnSim 4.0.0.12 released with Custom Grains and Axial Cross Section View/Animation _______________________________________________ BurnSimAnnouncements mailing list -- announcements(a)burnsim.com To unsubscribe send an email to announcements-leave(a)burnsim.com List info & management: https://mailman2.blastzone.org/postorius/lists/announcements.burnsim.com Archives: https://mailman2.blastzone.org/hyperkitty/list/announcements.burnsim.com/

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BurnSim 4.0.0.12 released with Custom Grains and Axial Cross Section View/Animation
by greg＠blastzone.org 05 Aug '26

05 Aug '26

Hello BurnSim users, a new version has been released and is ready for download at https://burnsim.com/download. New additions include custom 2D grain profiles drawn in program or imported from DXF or SVG and a new axial cross sectional view of the simulated motor. These are brand new features and I've tested quite a bit on my own, but assume there are still lots of bugs lurking in there. Please let me know anything you see that needs addressing. Version 4.0.0.12 - released 8/5/2026 * Added a Custom grain type: draw or import your own grain cross-section instead of picking a parametric shape. Import from an ASCII DXF, SVG, or raster image (PNG/JPEG/BMP), or build one from scratch in the new shape editor - an outer boundary plus repeatable holes and slots you can drag directly in the preview - and export back to DXF when you're done. This feature is brand new - see the caveats on the Download page * Added an axial (side-on) motor cross-section next to the radial preview, showing the grain stack, case, and nozzle for any grain type, with the same erosion slider animating both. Case/nozzle dimensions beyond throat and exit are estimated rather than modeled * Fixed a rasterization bug inflating a D grain's reported peak Kn by roughly 11% - other grain types were unaffected * Removed the Pie Segment grain type (it's no longer offered when adding a grain); a motor file that already has one still opens and explains what happened, instead of failing with an unrecognized-type error * Grain geometry the simulator can't actually represent (e.g. an oversized finocyl fin) is now flagged directly in the grid instead of silently simulating something else * Grains left with no burning surface (e.g. an end burner with both ends inhibited) are now reported instead of crashing the simulation * Sped up simulations where several grains share the same shape by eroding each distinct shape once instead of once per grain * Fixed New, Open, and Recent Files immediately discarding an unsaved motor instead of asking whether to save it first, the way closing the program already did * Fixed an imported custom grain shape occasionally being silently discarded instead of applied to the grain * Fixed the grain editor's toolbar overlapping the grain grid when the window was narrow Thanks! Greg Deputy

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burnsim announce test
by greg＠blastzone.org 04 Aug '26

04 Aug '26

Tsting again

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testing again
by greg＠blastzone.org 04 Aug '26

04 Aug '26

Yet again

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tryhing again
by greg＠blastzone.org 04 Aug '26

04 Aug '26

Trying again

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