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rotating wall inside of an MRF zone - fixedValue or movingWallvelocity? |
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March 26, 2009, 06:29 |
rotating wall inside of an MRF zone - fixedValue or movingWallvelocity?
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#1 |
New Member
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Hello together,
I simulate a simple axial fan with MRFSimpleFoam. Everithing works fine, however, I have got very low pressure jump predicted. I' looking now where mistake in my settings is. The question is what the type of boundary condition I should use for the rotor. Rotor in my simulation is a rotating fan wall inside of the MRF zone and rotates of course with the same angular velocity as the whole MRF zone. If I would use fixedvalue; uniform (0 0 0) like in the tutorial mixerVessel2D, does it stay at rest? Should I take movingWallVelocity instead (s. below)? From my ../0/U; ..... boundaryField { STATOR { type fixedValue; value uniform (0 0 0); } ROTOR { type movingWallVelocity; value uniform (0 0 0); ........... Other question for my full understanding: does MRF model in OF use an absolute velocity formulation or relative velocity formulation? "absolute" means it solves the equations still in non-rotating coordinate system, relative I mean as rotating coordinate system. This question refers to the problem I encountered, namely with absolute velocity formulation the wall should rotate, with relative should stay at rest relatively to the rotating zone where it is located in. Alex |
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April 17, 2009, 09:21 |
Resolved
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#2 |
New Member
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In the meantime I tried itself, read through the forum etc. If the case set up correctly fixed value condition for a wall inside of a rotating zone leads to correct radial velocity distribution on this wall. One can see it in paraview.
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November 28, 2013, 15:02 |
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#3 |
Member
Join Date: Aug 2013
Posts: 50
Rep Power: 13 |
hi evrikon,
sorry for bringing this old thread up. do you manage to get the right pressure rise? i simulate the radial fan now, and i got lower value of pressure rise. and the residuals of velocity fall only to 3rd order of magnitude. for this simulation, i use approach of mrf and turbulence model laundersharma and komegasst (low re model implementation). any suggestion for better result? |
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April 30, 2015, 04:51 |
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#4 |
Senior Member
M. Montero
Join Date: Mar 2009
Location: Madrid
Posts: 155
Rep Power: 17 |
Quick question.
Did you make any faceZone? It is to know if boundary faces are selected or not ( including wall faces) |
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