Problems with mapFields and moving mesh.

ghindi · March 27, 2010, 05:05

Hi there,

I've an engine cylinder mesh with a complex geometry, so the add/remove layer does not work for me, so I've created different meshs at every 5 crank angle degrees. So, for instance, after running from -100 CAD to -95 CAD with mesh "A", I need to map the fields to mesh "B" that will run from -95 CAD to -90 CAD.
I've created a mapFieldsDict to cut the patch in the piston boundary.
The problem is that the mapFields is creating a lot of cells with zero velocity in my domain, and this is no correct.
Does anyone know how to solve this problem?

Thanks in advance!

Gustavo.

Panagioto · April 23, 2010, 12:42

Hi,
I've used mapFields this way.

mkdir <new case's name>
cp -r <original case/constant> <new case's name>
cp -r <original case/system> <new case's name>

Then u refine the mesh and in the new case directory u put:

mapFields ../<original case> -consistent

Let me know if this works for you

ghindi · April 25, 2010, 06:56

Hi,
first of all, thanks for replying.

I've tested that already, without success. I mean, mapFields works but creates lots of regions with high gradients. So when I start the simulation, my Courant number is high and then it crashes. Even reducing the timestep does not work.

I don't know how to avoid this gradients when using mapFields.

If you have any other ideas, please let me know.

Regards,
Gustavo.

March 27, 2010, 05:05	Problems with mapFields and moving mesh.	#1
ghindi New Member Gustavo Join Date: Feb 2010 Location: Curitiba - PR - Brasil Posts: 16 Rep Power: 16	Hi there, I've an engine cylinder mesh with a complex geometry, so the add/remove layer does not work for me, so I've created different meshs at every 5 crank angle degrees. So, for instance, after running from -100 CAD to -95 CAD with mesh "A", I need to map the fields to mesh "B" that will run from -95 CAD to -90 CAD. I've created a mapFieldsDict to cut the patch in the piston boundary. The problem is that the mapFields is creating a lot of cells with zero velocity in my domain, and this is no correct. Does anyone know how to solve this problem? Thanks in advance! Gustavo.

April 23, 2010, 12:42		#2
Panagioto New Member Andres Join Date: Apr 2010 Posts: 3 Rep Power: 16	Hi, I've used mapFields this way. mkdir <new case's name> cp -r <original case/constant> <new case's name> cp -r <original case/system> <new case's name> Then u refine the mesh and in the new case directory u put: mapFields ../<original case> -consistent Let me know if this works for you

April 25, 2010, 06:56		#3
ghindi New Member Gustavo Join Date: Feb 2010 Location: Curitiba - PR - Brasil Posts: 16 Rep Power: 16	Hi, first of all, thanks for replying. I've tested that already, without success. I mean, mapFields works but creates lots of regions with high gradients. So when I start the simulation, my Courant number is high and then it crashes. Even reducing the timestep does not work. I don't know how to avoid this gradients when using mapFields. If you have any other ideas, please let me know. Regards, Gustavo.