pressure eq. "converges" after few time steps
Posted December 1, 2017 at 06:05 by kindle
Have a thread about simplefoam convergence.
Quote:
Originally Posted by maddalena
thank you, however:
corrected is extra, isn't it?
This will no improve the initial convergence, since the solver will stop when the relTol is 0.05. thus it will not run until 1E-12 but stop at 0.05. And pressure equation will be not converged smoothly, I guess. What are your experience on the subject? What do you mean with not efficient?
Somewhere else it has been suggested to use pressure tolerance 2 order of magnitude lower than velocity tolerance. Therefore, as I lower velocity tol, I must lower pressure tol as well. This was suggested as a "remedy" due to the higher difficulty on pressure eq to get convergence.
On the contrary of what reported above, fvSchemes attached on the last post used a linear upwind scheme...
Does it applies with tet mesh or with hea as well?
Hope to get it when published!
Therefore, my next steps are:
mad
corrected is extra, isn't it?
This will no improve the initial convergence, since the solver will stop when the relTol is 0.05. thus it will not run until 1E-12 but stop at 0.05. And pressure equation will be not converged smoothly, I guess. What are your experience on the subject? What do you mean with not efficient?
Somewhere else it has been suggested to use pressure tolerance 2 order of magnitude lower than velocity tolerance. Therefore, as I lower velocity tol, I must lower pressure tol as well. This was suggested as a "remedy" due to the higher difficulty on pressure eq to get convergence.
On the contrary of what reported above, fvSchemes attached on the last post used a linear upwind scheme...
Does it applies with tet mesh or with hea as well?
Hope to get it when published!
Therefore, my next steps are:
- use relTol 0.05 on p -> BTW, why not efficient?
- lower U tol
- use first order everywhere.
mad
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