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

rm24 · November 16, 2019, 06:42

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.

cwl · November 16, 2019, 14:26

It should work ok when you switch from steady to unsteady.
Look for the mistake.

rm24 · November 16, 2019, 14:55

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 )

cwl · November 18, 2019, 05:35

Quote:

Originally Posted by rm24

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.

November 16, 2019, 06:42	How do you map the data from one simulation onto another for initialisation?	#1
rm24 New Member Rikesh Mistry Join Date: Aug 2019 Posts: 4 Rep Power: 7	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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November 16, 2019, 14:26		#2
cwl Senior Member Chaotic Water Join Date: Jul 2012 Location: Elgrin Fau Posts: 438 Rep Power: 18	It should work ok when you switch from steady to unsteady. Look for the mistake.

November 16, 2019, 14:55		#3
rm24 New Member Rikesh Mistry Join Date: Aug 2019 Posts: 4 Rep Power: 7	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 )