# Mesh motion - Rolational velocity components

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 January 30, 2006, 05:09 Mesh motion - Rolational velocity components #1 Manoj Kumar Guest   Posts: n/a Hi Do we have the option of imposing rolational velocity components to a deforming mesh? I can find just x,y and z components in 'Edit Boundary>Mesh Motion' panel. Thanks Manoj

 January 30, 2006, 17:58 Re: Mesh motion - Rolational velocity components #2 Glenn Horrocks Guest   Posts: n/a Hi, Yes, you can do that but if the motion is only rotational it is easier to define it as a rotating frame of reference. Glenn Horrocks

 January 31, 2006, 07:43 Re: Mesh motion - Rolational velocity components #3 KBanks Guest   Posts: n/a Hi Manoj, If the mesh deformation itself is rotational, then you will either have to define that motion with an expression or use the Fortran Junction Box routine. After wasting many, many hours trying to get it to work "the easy way", I ended up only being able to achieve my aim using the Fortran method. It is difficult to say what will work for you without more detail of exactly what it is you are attempting to do.

 January 31, 2006, 07:55 Re: Mesh motion - Rolational velocity components #4 Manoj Kumar Guest   Posts: n/a Hi I am working on a problem where a block floats in water contained in a tank. Due to sloshing force the block translates and rotates. How do I go about? I tried using a CEL function but there I could find just the option of translational motion. I have been working on fluent and have recently shifted to CFX. Thanks and regards Manoj

 January 31, 2006, 18:31 Re: Mesh motion - Rolational velocity components #5 Glenn Horrocks Guest   Posts: n/a Hi, In that case the motion is best modelled as a deforming grid. Don't worry about modelling the rotations separately. The CEL function is where you enter the function to describe the motion of every node on the moving boundary surface. It is called translation as each node only has translation degrees of freedom, a node cannot rotate. To define a general motion including rotation you give the nodes on a surface different translations. KBanks is right in saying it is tricky to get these functions working, but I suggest you keep at it as in this case it will probably be much easier to define the motion as a CEL function describing the motion of the boundaries rather than a fortran function where you have to describe the motion of every node in the domain. I have done many deforming mesh simulations and have done all of them in CEL. Regards, Glenn Horrocks

 February 6, 2006, 11:05 Re: Mesh motion - Rolational velocity components #6 KBanks Guest   Posts: n/a Have you done rotations Glenn? It doesn't work as far as I (and a very well qualified ANSYS support engineer) found to our cost, at least for my application. Linear movements are a breeze on the other hand.

 February 6, 2006, 18:13 Re: Mesh motion - Rolational velocity components #7 Glenn Horrocks Guest   Posts: n/a Hi, Most of my stuff has been purely translation, and usually any rotations are fairly small. I have never tried doing translations with large rotations. Glenn Horrocks

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20 sc298 OpenFOAM Native Meshers: snappyHexMesh and Others 2 March 27, 2011 21:11 asherah STAR-CCM+ 0 February 19, 2010 18:45 samad87 FLUENT 1 August 10, 2009 01:02 samad87 FLUENT 0 August 6, 2009 03:15

All times are GMT -4. The time now is 13:05.

 Contact Us - CFD Online - Privacy Statement - Top