Support for non-neutral ABL in AMR-Wind LES with terrain #1798
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Hello, I have been studying the “LES with Terrain” setup in the AMR-Wind documentation. In the walkthrough it states that "the current terrain setup can only be used for the simulation of neutral ABL." I am interested in performing LES with terrain under non-neutral atmospheric stratification, and I would like to know whether this capability is now supported (or planned). Thank you in advance for your help. Best regards, |
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Replies: 1 comment
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Yes it is possible to do it. However, the stratification calculations are based on Monin-Obukhov length and not the heat flux. See the example here: https://github.com/Exawind/amr-wind/blob/main/test/test_files/abl_specifiedmol_unstable/abl_specifiedmol_unstable.inp. One thing to note is that if your terrain has a deep canyon, the solutions may not converge for very unstable cases (MOL<-80). We are working on a fix for that which has not been merged yet. |
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Yes it is possible to do it. However, the stratification calculations are based on Monin-Obukhov length and not the heat flux. See the example here: https://github.com/Exawind/amr-wind/blob/main/test/test_files/abl_specifiedmol_unstable/abl_specifiedmol_unstable.inp. One thing to note is that if your terrain has a deep canyon, the solutions may not converge for very unstable cases (MOL<-80). We are working on a fix for that which has not been merged yet.