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MRF-stirred vessel. Error in Power number for Impeller

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Default MRF-stirred vessel. Error in Power number for Impeller
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Dear all,
I am new to fluent . I have started one case of mixing tank simulation where my objective is to find out the power number for impeller. For this moment estimation is required.I have set the case as MRF. I am able to run the simulation with conversion but not able to calculate Moments for impeller wall. It is showing error of access violation. It occurs only for solid wall. I am attaching my case set up & some output results, Please help me if i am doing something wrong.

New Bitmap Image.jpg

case set up.jpg

residual curve.jpg

contours velocity.jpg

Error Message.jpg
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