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Fluid Cavity in abaqus

Fluid Cavity in abaqus

Fluid Cavity in abaqus

(OP)
Dear All
I am using Abaqus CAE and new on it. I want to simulate the heat transfer of an air filled capsule. This capsule is filled with atmospheric air and heated from its bottom. I want to simulate this problem such that the effect of the free convection of the air in the cylinder is taken into account.

For this purpose I have model the capsule in 3D in Abaqus 6.13, then in interaction module I have defined a "Reference point" as cavity point and the inside surface of the capsule as the cavity surface. In mesh module I have used an 8-node heat transfer brick (DC3D8)as the element type,

after submitting of the job the Error below generates:
"Only degrees of freedom 11 and above can be active in the model for this procedure. Check the procedure and element types used in this model."

What should I do to solve this error?

Thanks in advance
Vahab

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