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August 7, 2014, 19:47 |
mixing plane vs frozen rotor
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#1 |
New Member
Join Date: Jun 2013
Posts: 12
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Hi, I am simulating a fan system using MRF method. I have attached a picture showing the convergence path. Interesting, the frozen rotor converged nicely but the mixing plane floats on a high level. From your experience, do you think the mixing plane result is usable? How come they behave so differently. Exactly the same mesh, same physics, but the interface type is different.
Thanks. |
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August 21, 2014, 12:12 |
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#2 |
Senior Member
Ping
Join Date: Mar 2009
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your question is confusing since mrf is a type of motion to apply to a region whereas mixing plane is a type of interface to connect different regions
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August 21, 2014, 22:43 |
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#3 |
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Thanks Ping, but I am comparing frozen rotor and mixing plane. CCM+ didn't explain well that the default MRF and interface is in fact frozen rotor method.
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August 22, 2014, 05:09 |
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#4 |
Senior Member
Ping
Join Date: Mar 2009
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mrf is much more than frozen rotor since it applies to linear motion too
for the forum to help you we need to understand what you want to do so i will say this again in star-ccm+ terminology - mrf is a method to apply motion to one or more regions - mixing plane is a type of interface to connect two regions and does circumferential averaging of the fields and is used normally in combination with the mrf technique on multi-stage turbines with uneven blade numbers so you cant 'compare' the two |
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August 24, 2014, 20:46 |
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#5 | |
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Quote:
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August 25, 2014, 07:14 |
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#6 |
Senior Member
Ping
Join Date: Mar 2009
Posts: 556
Rep Power: 20 |
it would help if you explained this correctly in the first place rather than confusing us and remember than frozen rotor is not a term cd-adapco uses in the documentation
a mixing plane interface smears or averages the flow around its circumference, whereas a normal inplace interface transfers the flow from each local cell on one side to the matching cell on the other side of the interface and maybe with some interpolation if the interface is not conformal if you create a scalar scene and place just the interface in the scene and show axial velocity for example, the above will be very clearly shown there is no reason to use mixing plane interfaces unless the circular extent of the geometry on either side of the interface is not identical - eg you model one blade of a fan in a sector but connect it to a full cylindrical model of the rest of the domain |
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