# Rotating reference frame

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 April 4, 2006, 17:27 Hi, To compute flow in rota #1 Senior Member   Pei-Ying Hsieh Join Date: Mar 2009 Posts: 317 Rep Power: 11 Hi, To compute flow in rotating reference frame, centrifugal force and coriolis force are added to the momentum equation. If omega (rotation speed) is constant, then, one will compute these forces like the following: dimensionedVector Omega ( "Omega", dimensionSet(0,0,-1,0,0), vector(0, 2 *PI/60 *RPM, 0) ); //centrifugal foce volVectorField Fcent = (Omega ^ (Omega^mesh.C())); // coriolis force 2*Omega ^ U) What will happen if Omega varies with time? Is there any extra terms needed to be included? Thanks! Pei

 April 4, 2006, 20:45 Hi, One more question about #2 Senior Member   Pei-Ying Hsieh Join Date: Mar 2009 Posts: 317 Rep Power: 11 Hi, One more question about this. If the computational domain locates R away from the axis of rotation, where R >> l (l is the characteristic length of the computational domain), how does it affect the centrifugal force/coriolis force calculation? Pei

 April 5, 2006, 15:05 OK, I found the answer. #3 Senior Member   Pei-Ying Hsieh Join Date: Mar 2009 Posts: 317 Rep Power: 11 OK, I found the answer. Another force term due to angular acceleration needs to be added as follows: d(Omega)/dt ^ mesh.C() pei

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