# Contra rotating rotor simulation using mixing plane method

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 June 18, 2012, 16:04 Contra rotating rotor simulation using mixing plane method #1 Member   venkatesh Join Date: May 2012 Posts: 93 Rep Power: 6 Hi everyone, I am trying to simulate flow around Contra rotating rotor using mixing plane method. I have some doubt in defining boundary condition on rotor blade. I defined Front rotor and Second rotor as Stationary wall. Front rotor is rotating in Counter clock wise direction (according to Right hand thumb rule). So i define the fluid in the Front rotor region as Moving reference frame which rotates about X- axis (1 0 0) at -1800 rpm (negative sign for Counter clockwise direction), Relative to Cell zone:- absolute. The second rotor rotates in opposite to that of Firs rotor about X-axis (1 0 0) at 1800 rpm (Positive sign for clockwise direction). relative to cell zone: Opposite to front rotor Fluid When I check the Relative velocity vector, The Direction of the relative vector for the front rotor is along Counter Clockwise direction which is wrong ( it should be in clock wise direction because of the fact that the blade rotates in counter clock wise direction) but the relative velocity vector for the second rotor looks perfect. Please can someone help me to define the proper boundary condition. thanks in advance for your information, Venkatesh

August 29, 2012, 05:36
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Quote:
 Originally Posted by venkat_aero2007 Hi everyone, When I check the Relative velocity vector, The Direction of the relative vector for the front rotor is along Counter Clockwise direction which is wrong ( it should be in clock wise direction because of the fact that the blade rotates in counter clock wise direction) but the relative velocity vector for the second rotor looks perfect.
Because you are looking at velocity vectors in second rotor reference frame. Choose the correct domain and velocity vectors will look fine.

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