# how to apply constant velocity to particles during the simulation

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 January 24, 2014, 02:52 how to apply constant velocity to particles during the simulation #1 Senior Member   mohammad Join Date: Dec 2010 Location: UK Posts: 243 Rep Power: 15 Dear all, I am simulating a domain with some particles moving in a certain direction during the whole simulation. My problem is to apply this constant velocity to the particles in the entire domain and during my simulation. Does anyone have any idea or suggestion? thanks

 January 24, 2014, 03:47 #2 New Member   Marek Chodorski Join Date: Aug 2013 Location: Poland Posts: 13 Rep Power: 11 Hi, Have a look here - description is in polish http://feazone.org/readarticle.php?article_id=11 vx, vy, vz are wind velocity. If equation you solve is the same use Galerkin method with up-winding. Marek

 January 24, 2014, 05:17 #3 Senior Member   Join Date: Nov 2013 Posts: 1,965 Rep Power: 25 I could imagine a udf that looks like this: Code: ``` DEFINE_DPM_SCALAR_UPDATE(fixedvel,cell,thread,initialize,p) { P_VEL(p)[0]=10.0; P_VEL(p)[1]=0; P_VEL(p)[2]=0; }``` This will give a velocity in the x-direction of 10 m/s, once you attached the udf to the dpm modeling. Although I must admit that I find it difficult to believe that you really want to force the particles to always have the same velocity, and would advise you to take a step back and look at your physical model and the problem you are trying to solve.

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