Problem with p_rgh with interDyMFoam in a ship roll decay test

karmo · August 23, 2012, 14:09

Hi everyone. I'm trying to carry out a simulation of a Roll decay test of a ship in OpenFoam 2.1.1. I've modified the floatingObject tutorial, using snappyHexMesh to implement the ship's hull.

When I start the simulation the p-rgh field seems like this

time0.png

but quickly, at time 0.001, it seems like the next image

time1.png

There's a strange lack of pressure at the bottom of the ship, which comes with a very strong pitch movement. The COG linear velocity in Z axis rises about 1 m/s in 0.005 seconds. I've tried many different meshes, bigger and smaller, with more or less cells, but the problem is still here. Please help me, I need to carry out this simulation, it's part of a very important project.

Thank you very much in advance.

mksingh · August 23, 2012, 18:07

Hi Juan,
Please see the following discussion on forum regarding p_rgh:
http://www.cfd-online.com/Forums/ope...urrents-7.html
May be you find some relevant information.

August 23, 2012, 14:09	Problem with p_rgh with interDyMFoam in a ship roll decay test	#1
karmo New Member Juan Carlos Carmona Join Date: Aug 2012 Posts: 1 Rep Power: 0	Hi everyone. I'm trying to carry out a simulation of a Roll decay test of a ship in OpenFoam 2.1.1. I've modified the floatingObject tutorial, using snappyHexMesh to implement the ship's hull. When I start the simulation the p-rgh field seems like this time0.png but quickly, at time 0.001, it seems like the next image time1.png There's a strange lack of pressure at the bottom of the ship, which comes with a very strong pitch movement. The COG linear velocity in Z axis rises about 1 m/s in 0.005 seconds. I've tried many different meshes, bigger and smaller, with more or less cells, but the problem is still here. Please help me, I need to carry out this simulation, it's part of a very important project. Thank you very much in advance.

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August 23, 2012, 18:07		#2
mksingh New Member M K Singh Join Date: Sep 2009 Posts: 19 Rep Power: 17	Hi Juan, Please see the following discussion on forum regarding p_rgh: http://www.cfd-online.com/Forums/ope...urrents-7.html May be you find some relevant information.