# Sloshing - Free surface

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 January 3, 2016, 01:55 Sloshing - Free surface #1 New Member   hossein Join Date: May 2012 Posts: 28 Rep Power: 14 Hi, I am trying to simulate sloshing in rotating cube (±30 degrees) (2D). The cube is rotating around center of lower side. mesh :structured Homogeneous Model Turbulence : None (Laminar) Unfortunately when cube rotates, the free surface gets irrational slope, and seems that water does not transfer properly between parts ( left and right of wall) \ \ \ \ What is the problem? How can I fix it? I have tried other turbulence models, but it was not the solution and nothing changed. Even I turned on surface tension, but nothing changed. Please help me ASAP. Last edited by hossein_sml; January 14, 2016 at 02:04.

 January 4, 2016, 05:10 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,771 Rep Power: 143 Please attach your CEL. Are you modelling the rotation using rotating frames of reference or moving mesh?

 January 4, 2016, 06:25 #3 New Member   hossein Join Date: May 2012 Posts: 28 Rep Power: 14 the mesh is moving ( Boundary and mesh is moving )

 January 4, 2016, 06:26 #4 New Member   hossein Join Date: May 2012 Posts: 28 Rep Power: 14 Please click one of the Quick Reply icons in the posts above to activate Quick Reply.

 January 4, 2016, 06:37 #5 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,771 Rep Power: 143 This could be caused by: * Inadequate convergence * A mesh error where the left and right side of the meshes are not connected * The left to right flow is slow, so you have to run it for more simulation time for the flow to reach the equilibrium level.

 January 4, 2016, 07:03 #6 New Member   hossein Join Date: May 2012 Posts: 28 Rep Power: 14 - All meshes and boundary are moving with same rotational speed. - Max. Coeff. Loops : 10 Residual Target :1e-05 - What do you mean from "The left to right flow is slow, so you have to run it for more simulation time for the flow to reach the equilibrium level" in one simulation, the simulation continued for 4-5 s, but results got worst.

 January 4, 2016, 17:33 #7 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,771 Rep Power: 143 You need to do a sensitivity analysis to see if your convergence is tight enough. Run a tighter or looser residual and see if it makes any difference. You will need to show more details of what you are doing if you want us to help you more. Please attach an image of your mesh and CCL.

 January 5, 2016, 02:52 #8 New Member   hossein Join Date: May 2012 Posts: 28 Rep Power: 14 I tried various residuals but nothing changed. I have used structural mesh as below, Also I tried with unstructured (Hexa) mesh, but it did not work too. about ccl which part do you need to know?

 January 5, 2016, 18:45 #9 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,771 Rep Power: 143 All of the CCL. It is a small text file so should be easy to attach to the forum post.

 Tags cfx 14.5, free surface, sloshing