# Moving Mesh and MRF

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 May 13, 2002, 09:41 Moving Mesh and MRF #1 Romain Guest   Posts: n/a I have done an unsteady problem of a blade moving in a fluid with the moving mesh. I have also done it with MRF in steady state. After a while, the unsteady problem with the moving mesh gives the same velocity profiles as with MRF in steady state. 1)Is it normal (I am sorry, but I don't understand very much the explanations of the users' guide)? Can I consider the MRF as the calculation is very shorter? I also did in steady state with Moving mesh, but the results aren't the same. 2)Why? Whtt's the difference with MRF? Thanks a lot for your answers

 May 16, 2002, 03:45 Re: Moving Mesh and MRF #2 Alain Guest   Posts: n/a Hi, if your problem is to model a single blade moving in the fluid then it is the same thing than having a fixed blade in a rotating air. So it is absolutly normal that you have the same results with moving mesh, MRF and a single rotating frame of reference. A single rotating frame would be sufficient to solve your problem and it is also the correct approach. On the other hand you can't do steady state calculation with moving mesh : it an intrisic unsteady model. Best regards