CFD Online Discussion Forums - how to apply constant velocity to particles during the simulation

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)

- FLUENT (https://www.cfd-online.com/Forums/fluent/)

- - how to apply constant velocity to particles during the simulation (https://www.cfd-online.com/Forums/fluent/128921-how-apply-constant-velocity-particles-during-simulation.html)

how to apply constant velocity to particles during the simulation

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

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

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.