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Number of internal iterations in the Dual time method

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Old   December 23, 2013, 09:52
Default Number of internal iterations in the Dual time method
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Anant Diwakar
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Hi All

I am trying to run an unsteady simulation using Dual
time stepping, over NACA0012 airfoil.
I am using Euler Implicit time integration scheme.

I wanted to know how to select the value of internal iterations
UNST_INT_ITER, for the dual time method ?

I ran the steady case which took around 40000 iterations for the
given convergence criteria.

Is the value of internal iterations for the dual time method related to this ?

Thanks
Anant
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Old   January 11, 2014, 23:16
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Francisco Palacios
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Instead os specifying the number of iteration you can specify the convergence level (3-4 order of magnitude would be OK)
RESIDUAL_REDUCTION= 3
In principle the inner iteration should converge quicker than the steady state case because the physical step is typically very small and your initial guess is close to the final solution after Deta t.

Best Regards,
Francisco
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