ANSYS APDL help for 3D Thermal problem

Thread starter Stacky
Start date May 18, 2013
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3d Ansys Apdl Thermal

In summary, to define material properties in ANSYS APDL for a 3D thermal problem, you can use the MATERIAL command or the MP/MAT commands to assign properties to specific elements or nodes. There are two types of thermal analysis in ANSYS APDL: steady-state and transient. Steady-state analysis assumes a constant temperature distribution, while transient analysis considers time-dependent changes. Boundary conditions can be applied using the D, S, F, or CM commands. Results can be visualized using the POST1 command or the PLNSOL command. To improve accuracy, using a finer mesh and accurately defining material properties and boundary conditions is important.

May 18, 2013

Stacky

Hello,
Greetings! How do I get the convective surface matrix from ANSYS for 3D thermal problem. Consider a volume, where some of its surfaces are subjected to convective boundary conditions. What is the way to get those (only convective surface) matrices generated by ANSYS. Any help in this direction is very much appreciated.

Thank you
Stacky

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May 23, 2013

CFDFEAGURU

Look up APDL Math in the help manual.

Thanks
Matt

FAQ: ANSYS APDL help for 3D Thermal problem

1. How do I define material properties in ANSYS APDL for a 3D thermal problem?

To define material properties in ANSYS APDL for a 3D thermal problem, you need to use the MATERIAL command. This command allows you to specify the material name, thermal conductivity, specific heat, and density. You can also use the MP or MAT command to define material properties and assign them to specific elements or nodes.

2. What is the difference between steady-state and transient thermal analysis in ANSYS APDL?

Steady-state thermal analysis in ANSYS APDL assumes that the temperature distribution within the model remains constant over time. Transient thermal analysis, on the other hand, takes into account the time-dependent changes in temperature and considers the effect of heat transfer over time. In other words, steady-state analysis is suitable for problems with a constant heat source, while transient analysis is more appropriate for problems with changing heat sources or for studying thermal behavior over time.

3. How can I apply boundary conditions in ANSYS APDL for a 3D thermal problem?

To apply boundary conditions in ANSYS APDL for a 3D thermal problem, you can use the D, S, or F command. The D command allows you to specify a temperature at a particular node or element, while the S command sets the heat flow or heat flux at a boundary. The F command can be used to apply a heat generation rate at a boundary. You can also use the CM command to define convective and radiative boundary conditions.

4. Can I visualize the results of a 3D thermal analysis in ANSYS APDL?

Yes, you can visualize the results of a 3D thermal analysis in ANSYS APDL by using the POST1 command. This command opens the ANSYS Postprocessor, where you can plot temperature contours, temperature distribution along a path, or temperature variation over time. You can also use the PLNSOL command to generate a surface plot of temperature distribution on your model.

5. How can I improve the accuracy of my 3D thermal analysis in ANSYS APDL?

To improve the accuracy of your 3D thermal analysis in ANSYS APDL, you can use a finer mesh. A finer mesh allows for more accurate temperature gradients and can capture localized heat transfer effects. You can also refine the mesh in regions where there are significant temperature variations. Additionally, it is important to ensure that the material properties and boundary conditions are accurately defined for your model.