# Using symmetry plane for flow but not particles in steady-airflow one-way coupled DPM

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 December 6, 2021, 02:17 Using symmetry plane for flow but not particles in steady-airflow one-way coupled DPM #1 New Member   Jake C Join Date: Aug 2020 Posts: 4 Rep Power: 5 I am running a series of steady-state airflow simulations and then using the converged steady-state airflow fields to run one-way coupled transient DPM simulations (without iterating on the airflow field). Is there a way i could leverage a symmetry plane to reduce the calculation time of the symmetric airflow field but then reconstruct the full domain to run the particle simulations? Since the particle simulations would not be symmetric as particles would not reflect at the center of the domain and injections will be located throughout the symmetric subdomain. Is there a way to for example; export, transform about a center point, and reconstruct an .ip file from half or a quarter of a symmetric rectangular domain and loading them into a DPM simulation with a mesh of the full domain?

 December 6, 2021, 03:11 #2 Senior Member   Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,678 Rep Power: 66 The .ip file only contains the solution data, it doesn't have any mesh in it. And you need not only the flowfield but the mesh to be mirror'd as well. Good news is, the solution is linked to the mesh and transforming a mesh also transforms the solution with it. Run your half-field case with symmetry planes. Save it to say banana.cas and banana.dat Start a new empty case. Load banana into your case. Apply a mesh transformation to the banana thingy that you just imported. If your mesh is symmetric over one of the coordinate planes then this step can be as simple as scaling the mesh using a scaling factor of -1 ( minus 1, you can use negative scale factors). If your mesh is oriented somewhere out in the universe, then you just do the math to transform your mesh correctly. So now you have flipped your half-domain over the mirror plane, wherever it is. Then import banana.cas again and append it to the current working case. Now you have the two mirrors. Now just merge the zones and faces together. If you started with 1/4 and want to make a 4/4, then just repeat all this one more time.

 Tags dpm, dpm fluent, symmetry bc