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How do you map the data from one simulation onto another for initialisation?

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Old   November 16, 2019, 06:42
Default How do you map the data from one simulation onto another for initialisation?
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Rikesh Mistry
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Hello,

I have a simulation which has run under steady conditions. I want to change one of the region's continua to close a flowloop essentially.

I tried changing the continua and running he simulation on but get an error (floating point divided by 0). When I reset the mesh and clear solution and change continua of the region the simulation runs fine, so the issue appears to be when I change the continua on a simulation that has already run.

How do I map the simulation data from my first run into another with an identical mesh ie initialise a simulation with results from a previous mesh.
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Old   November 16, 2019, 14:26
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It should work ok when you switch from steady to unsteady.
Look for the mistake.
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Old   November 16, 2019, 14:55
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The issue is not the switch to unsteady, this works fine.

The problem is when I change the continua of a previously fluid section to that of a solid (to close a valve )
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Old   November 18, 2019, 05:35
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Quote:
Originally Posted by rm24 View Post
The problem is when I change the continua of a previously fluid section to that of a solid (to close a valve )
That is too "sudden" change and incorrect in general.

If you want to close the valve - you can model valve by:
- using overset/rotating region;
- using porous media with resistance increasing over time;
- setting momentum source in a valve region to reduce velocity to zero.
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