avoid that numerical instabilities trigegring the KHI #4462
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
related to ComputationalRadiationPhysics#3234 We observe since long time that our KHi is seeded by nummerical issues instead a well reproducable condition. I came up with the idea to use the composit pusher to create maxwell conform fields over 500 steps and then start to real KHI simulation. @PrometheusPi suggested to use a random position for electrons and ions and not using the temperature seeding for electrons.
|
@psychocoderHPC what is the status of this pull request? Do we need to discuss something? Are these just CI errors and no real code errors? |
|
We need to discuss the physics and if my changes make the KHI better or not. |
|
Since we discussed the options offline a while ago, what is the plan with this PR? |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
related to #3234
We observe since long time that our KHi is seeded by nummerical issues instead a well reproducable condition.
I came up with the idea to use the composit pusher to create maxwell conform fields over 500 steps and then start to real KHI simulation. @PrometheusPi suggested to use a random position for electrons and ions and not using the temperature seeding for electrons.
The results look quite good.
The python tool is adjusted to ignore the first 28 outputs.
./bin/picongpu -d 1 1 1 -g 192 128 128 --periodic 1 1 1 -s 2500 --fields_energy.period 20 --e_png.period 100 --e_png.axis yx --e_png.slicePoint 0.5 --e_png.folder pngElectronsYX --e_macroParticlesCount.period 100 --e_energy.period 20 --e_energy.filter all --i_energy.period 20 --i_energy.filter all