Meaning of non-physical points ...
Hi All,
I had few queries regarding SU2 terminology. :confused: 1. Several times I encounter this msg: The solution contains n non-physical points. What does this refer to ? 2. How are the residuals defined? Lets say the value at some iteration for variable 1 is -3.4567. What does it indicate? Does it mean log_10 (Var1_i iter/ Var1_ i-1 iter)? 3. Has anyone tried using 2 level Multigrid? How to decide optimal child/parent ratio for a given grid? Would appreciate your response. Thanks, Deepanshu. |
Non-physical points means that after the solution update the density is negative.
Su2 computed the L2 norm of the residual and plots the Log10 of the value. In other words a value of -12 means that the residual is 10^-12. To set the optimal parameters of the MG is an art. when you have convergence issues do not forget to reduce: % Damping factor for the residual restriction MG_DAMP_RESTRICTION= ____ % % Damping factor for the correction prolongation MG_DAMP_PROLONGATION= ____ Best Regards, Francisco |
Meaning of non-physical points ...
Dear Francisco,
Thank you for your inputs. Deepanshu. |
Set Multigrid=0, the non-physical points can be removed.
It works sometimes for me. |
Thanks Sean for your inputs.
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