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I encountered a problem which has baffled me for a long time. I am using CFX11 to simulate an oscilating airfoil with reference frame. I put the airfoil in a circle region which is oscilating and the outer circle aerea is stationery. I monitored the Fx Fy as drag and lift because the incidence is always horizontal from the far field inlet. However the monitored drag is not right and the lift seems reasonable. When I stop the solver to check it up in the post, the drag turned out to be reasonable. how could this happen? is that because the cfx solver doesn't support the reference frame syntax? if so why the lift is ok. I am carrying out unsteady cases, and now I have to save a lot results for a whole cycle to get the drag hysteresis loop and it's not smooth since the points are limited compared with monitored curves. Could anyone help me? Thanks!