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March 18, 2013, 02:45 |
FSI problem of improper constraint
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#1 |
Member
Dr. Moloy Kumar Banerjee
Join Date: Jun 2011
Posts: 71
Rep Power: 14 |
Dear all,
I am trying to simulate the FSI problem where, a fluid is flowing through a pipe of dia 2cm and length 8cm. My aim is to check the behavior of the wall material under the influence of fluid flow and vice-verse. For this simulation I select the Youngs modulus for the pipe material as 10Mpa, and poissons ratio as 0.3 and density of 1050 kg/m3. For the fluid model I have selected the density as 1050kg/m3 and the viscosity as 0.003 Pas. For fluid domain BC, I used transient pressure at inlet and zero gauge pressure at outlet. For the structural domain I select the front faces of the wall as stationary(as shown in figure) and the two surface that in contact with the fluid domain as fluid-solid-interaction BC. My aim is to do the 2D analysis of the problem and hence I choose 2-3 element thickness of the entire geometry in the z-direction. Both the front and Back end of the fluid domain are given the symmetry BC. Once I start the simulation using system coupling it shows the error " improper constraint in the structural system, which results in a very high displacement Uy=10^33 and finally it stops" Is there any correction needed in the constraint definition. Please help me to rectify the problem.. |
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