Problem to model a simple (at first glance) stationary problem of thermomechanics in an elastic formulation in ANSYS Mechanical APDL.
There is a simple block (brick), with spatial non-uniform volumetric heat generation (HGEN).
The back and front faces are convectively cooled with given (but different) HTC's and fluids temperatures.
The properties of block (thermophysics + mechanics) are assumed to depend on temperature.
HOW TO simulate the temperature field in a brick, taking into account thermal expansion?
Hi Sergey,
maybe have you considered the option to solve the problem in Ansys Mechanical (using Workbench) instead of Ansys Mechanical APDL?
For this case, after generating the geometry,you will need:
- To define the material properties as a function of temperature
- To assign a heat generation load or to create an external file with the constant (or variable) heat generation load
- Solve a steady state thermal problem (to find the temperature distribution)
- If required, use the temperature in a steady state structural system to obtain the thermal stresses (after applying the proper boundary conditions).
This approach can be usefull to obtain a first model, then, if required, you can increase the complexity by using APDL.
I hope it helps.
Cheers,
Ramiro
Hello Ramiro!
Thx for answer and spending free time for this question!
Well, I used to prepare the brick model and execute actions according to your algorithm before I asked the question here. I do understand the algorithm but receive the expected result, i.e. unstable rising of brick temperature.
I applied PLANE77 elems for SS thermal analysis and PLANE183 ones for SS structural FE a ND analysis.
I used solver op's for nonlinear effects on geometry (NLGEOM, ON) and elems update (UPGEOM) after each cycle of thermomechanical iteration.
I suspect heat balance is not constant with every new thermomechanical iteration iteration. But I don't know how to receive this data out of ANSYS. Perhaps *GET command will help through SMISC op's for elems.
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