[hguvenc]

Hello,

I want to ask 3 questions:

1- For a complex car shape doing simulation with steady state and doing with implicit unsteady changes anything?

2- which method decrease simulation times?

3- starting with steady after changing implicit unsteady brings something?

[arjun]

Originally Posted by hguvenc

Hello,

I want to ask 3 questions:

1- For a complex car shape doing simulation with steady state and doing with implicit unsteady changes anything?

2- which method decrease simulation times?

3- starting with steady after changing implicit unsteady brings something?

1. Simulation on coarse mesh, then results interpolated to finer mesh.

2. Quick steady improvement on the interpolated values.

3. Careful switching to unsteady.


Step 3 is problem part because fluxes jump during this step and can destroy the solution computed by steady solver.

[hguvenc]

Originally Posted by arjun

1. Simulation on coarse mesh, then results interpolated to finer mesh.

2. Quick steady improvement on the interpolated values.

3. Careful switching to unsteady.


Step 3 is problem part because fluxes jump during this step and can destroy the solution computed by steady solver.

Is there differences between steady and unsteady solution for time independent boundary condition?

[arjun]

Originally Posted by hguvenc

Is there differences between steady and unsteady solution for time independent boundary condition?

This is problem dependent but here the main difference is how fluxes are computed and this is different in steady and in unsteady cases.