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 March 17, 2012, 06:48 Unsteady flow and DPM #1 Member   Dr. Moloy Kumar Banerjee Join Date: Jun 2011 Posts: 71 Rep Power: 6 I want to study the behavior of the particle under the unsteady flow. Consider a situation where the flow through a pipe in pulsatile in nature, say at the inlet to the pipe, the velocity is given as V=V_0*(1+sin(w*t)). If I solve the unsteady Fluent Solver, it will give the result, but what happens if I wants to solve the DPM along with this. For, steady flow like V=V_0, first the eulerian flow field has to be solved, then we switch on the DPM. Now, how to implement this in case of pulsatile problem. Thanks in advance.

 March 17, 2012, 15:21 #2 Member   Domenico Join Date: Sep 2011 Location: Atlanta Posts: 39 Rep Power: 5 hi do you mean how to set up a pulsatile injection of discrete phase, or just to couple any injection to a pulsatile eulerian phase? regards

 March 17, 2012, 20:28 #3 Senior Member   Join Date: Jul 2009 Posts: 210 Rep Power: 8 1) Get your solution converged in Transient form. 2) Turn on your DPM and then click on 'unsteady particle tracking' under the DPM setup. Solve for further time periods. This will solve particles alongside your momentum, etc equations.

 March 21, 2012, 00:52 #4 Member   Dr. Moloy Kumar Banerjee Join Date: Jun 2011 Posts: 71 Rep Power: 6 Dear kingjewel1 Thaks for your reply. Once I solve the pulsatile eulerian then if i turn on the DPM, then how the fluent will take the same flow solutions for Lagrangian tracking of the particle?

 March 21, 2012, 00:55 #5 Member   Dr. Moloy Kumar Banerjee Join Date: Jun 2011 Posts: 71 Rep Power: 6 Dear doronzo Thanks for the reply. I wants to couple the injection with the pulsatile flow.

March 21, 2012, 04:28
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Quote:
 Originally Posted by moloykb Dear kingjewel1 Thaks for your reply. Once I solve the pulsatile eulerian then if i turn on the DPM, then how the fluent will take the same flow solutions for Lagrangian tracking of the particle?
Because you need to turn on 'UNSTEADY tracking' in DPM:

and solve the particles at the same time as the flow equations.

You could even do this right from the very beginning but I'd allow at least one cycle to elapse before you did.

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