I want to simulate root blower. The preferable simulation is steady state with MFR. My concern is how to simulate the overlapping mesh. We dont have polyflow, to use 'Mesh Superposition Technique'. Do this technique require moving mesh analysis, which we are trying to avoid.

Ref : http://www.fluent.com/solutions/examples/x219.htm

Carno

stedy state analysis doent require moving mesh use of MRF will solve this problem what is mesh overlapping?

Dear Sach,

I do not understood your sentence of steady state simulation does not require MRF. If blower is rotating steadily, MRF is required and it is not transient simulation as far as I know. One of the condition for MRF is that the interface of rotating and stationary domains should be at constant distance from centre of rotation. i.e. it should be circular. In case of roots blower, there are two rotors meshing (like gears) with each other. So we cant have domains with circular interface here since two rotating domains with different centres overlap each other. Same case happens with gear pump. Method to simulate gear pump and roots blower may be same.

[cfdarpit]

How do u create CAPS for inlet and outlet?
As i tried i receive error as HOLE FILLING FAILED.

[pranjal]

I am taking time: steady state and simulating a roots blower but the output like mass flow rate are varying when roots are in different angle in steady state simulation. Can some one help me!!!! What may be wrong in the simulation???