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Hi

I want to design a fan in cooling tower. my problem is appear when i want to define interfaces domain in cfx pre. i can not define and separate solid and fluid interface domain. When i use enclosure in spaceclaim i did not have this problem but when i sketch the fluid domain in spaceclaim this problem has appeared. how can i solve it???? TNX for your help

I would suggest to ask this question in the ANSYS Geometry and meshing forum.
And then, please add pictures of what you are trying to do and what goes wrong. In this way it is difficult to help.