# Dynamic Mesh UDF question

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 June 1, 2010, 01:30 Dynamic Mesh UDF question #1 New Member   amin gh Join Date: Apr 2009 Posts: 1 Rep Power: 0 Dear users, I want to assign a movement to a rigid wall in order to generate wave. But problem is here, having no velocity function ( vel (time)) , how can I make the wall move with a time-history of displacement. Best Regards, Amin

 June 1, 2010, 03:45 #2 Member     Join Date: Mar 2009 Posts: 49 Rep Power: 10 Hi, you can do it via DEFINE_CG_MOTION. It can be used to give walls velocities w.r.t. to any functional relation to time. The function is pretty well explained in the UDF User Guide including an example. And if you search for it in the forum you will find some examples of others. cheers

 June 1, 2010, 10:48 #3 New Member   Join Date: Mar 2010 Posts: 19 Rep Power: 9 Hi If you want to simulate a flap-type wave maker (I suppose yes, regarding your description), I advise you to check the following paper (wow, was right in front of me at this moment :O) where are defined the flap displacement functions - For those, you need to write an UDF with the macro above (DEFINE_CG_MOTION): Lal, Anant; CFD Simulation and Validation of Flap-Type Wave-Maker. World Academy of Science, Engineering and Technology vol. 46 pp 76-82, 2008 But you don't need to simulate the displacement of the flap in order to create waves in FLUENT. You can assign Velocity-Inlet BC to your wave-maker wall and input an UDF with the x and y wave velocities from the linear wave theory or stokes theory. And it gets easier if you have the last version of FLUENT. go to Define - Models - Multiphase - VOF - Open Channel Flow / Open Channel Wave BC (check them both), and then in wave maker wall: BC Velocity Inlet and input in FLUENT GUI your wave info. Check V12.0 and V12.1 FLUENT users guide for more info.

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