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#1 |
New Member
Giovanni Bettega
Join Date: Sep 2014
Posts: 9
Rep Power: 11 ![]() |
Hello Forum,
please, consider the following CFL settings, in a .cfg file: % ----------- % CFL number % ----------- CFL_NUMBER= 100 % ------------------------------------------------------------------ % CFL adaptation ON % factor down, factor up, CFL minimum, CFL maximum, limit tolerance % ------------------------------------------------------------------ CFL_ADAPT= YES CFL_ADAPT_PARAM= ( 0.1, 1.1, 1.0, 100, 0.001) Questions: 1) at the very beginning of the run what is the CFL number? The calculation starts with CFL_NUMBER= 100, or CFL minimum? 2) what happens if CFL_NUMBER > CFL maximum or CFL_NUMBER < CFL minimum (example: CFL_NUMBER= 200 CFL_ADAPT= YES CFL_ADAPT_PARAM= ( 0.1, 1.1, 1.0, 100, 0.001) ) Thank you for your help Giovanni |
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#2 |
Senior Member
bigfoot
Join Date: Dec 2011
Location: Netherlands
Posts: 596
Rep Power: 17 ![]() |
1. the initial CFL is CFL_NUMBER
2. the initial CFL is bounded using CFL=max(min(CFL_NUMBER,CFL_MAX), CFL_MIN) 3. When CFL hits the bounds, it stays at the bounds unless the simulation destabilizes again. 4. you can observe what happens using SCREEN_OUTPUT= AVG_CFL |
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Tags |
cfl number, cfl specification |
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