Are there any examples of using a 2D table array to define the TCC real constant?
|
Yes, please see the attached ANSYS 11.0 transient heat transfer input file. The model consists of two SOLID70 blocks separated by a small gap. Heat passes through the interface via TARGE170 and CONTA173 elements. The thermal contact conductance (TCC) is interpolated from a two dimensional table array. The primary variables used in the example are temperature and X coordinate location. Other possible primary variables include pressure and time. Adding the effect of pressure would require a coupled-field analysis, such as using SOLID5 elements instead of SOLID70 and setting KEYOPT(1) for both SOLID5 and CONTA173 to include the displacement DOFs (degrees of freedom). Anyhow, for this thermal-only DOF model, you can vary the gap between the two blocks and set the bulk fluid temperature of the convection loads applied to the top of the first block and to the right side of the second block. This will result in a TCC value based directly on the X coordinate of the contact element (which turns out to be the gap size, since the first block ends at X=0 and the contact elements on the second block are at X=contact gap size). The calculated TCC value is also influenced by the bulk fluid temperature, since it determines the rate of heat transfer, and thus, the temperatures of the contact and target surfaces, the average of which is used by the table array to interpolate on a TCC value. This TCC value, in turn, will alter the rate of heat transfer, thereby changing the contact and target surface temperatures and change the TCC value again. This cycle continues throughout the transient. The main heat source is a heat flux that is applied to the left side of the first block. . |
||
|