Unlike steady-state thermal analysis in ANSYS®, the boundary conditions that are applied as heat input and others are affecting the system with changing with the changing time in transient thermal analysis. For problems that there are abrupt changes in thermal situations such as heat exchanger analysis, rocket nozzle analysis, or engine analysis.
In these engineering systems, heat or other thermal inputs are changing with changing times.
Thermal stress is another situation that occurs because of the contraction or expansion of material with the changing temperature. To assess the thermal stresses and see failures because of them, transient thermal analyses can be linked to structural analyses in ANSYS Workbench.
In most engineering thermal analyses in ANSYS®, nonlinearities are very important. Material properties change with the changing temperature and this leads to nonlinearities in FEA problems. Nonlinearities are solved with special iterations that require more computational sources.
Like the other analysis types in ANSYS®, you need to follow a bunch of steps to make transient thermal analyses in ANSYS®. Each step requires special professions. To obtain correct and reliable results from our transient thermal simulations, we need to take special care of each step.
When you open the ANSYS® WB on your computer, there will be a list that shows all the analysis systems on the left side of your screen. From this list, drag the ‘Transient Thermal’ into the project schematic with your mouse.
Specification or definition of materials in ANSYS® which will be used in transient thermal analyses is very important. There are a bunch of features that ANSYS® provides to users about monitoring materials;
You can moderate the materials that you will use in ANSYS® transient thermal analyses.
At the geometry tab that you dragged inside the ANSYS® project schematic, you can create new geometry by using the options of; ‘New SpaceClaim Geometry…’ or ‘New DesignModeler Geometry..’.
Or you can ‘Browse’ a created geometry from another CAD environment. We recommend you that browse your geometry in .stp or .iges extensions.
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Double click on the ‘Model’ tab to open Mechanical Interface. And make basic adjustments to each geometry inside the model.
After entering into the ANSYS® you can make the basic adjustments below;
Nonlinearities and thermal strain effects require much more computational sources. So, you need to consider the elongation of analysis solving time when you are adjusting these options in ANSYS® Mechanical.
If you have the assembly, you need to check the contacts between the geometric bodies to obtain assemblies.
Creating a well and optimized mesh structure requires and another kind of profession. When you are creating the mesh structure, you need to consider a bunch of things;
From this article, you can find out important mesh options that are required in ANSYS® transient thermal analyses.
Right-click on ‘Transient Thermal’ in ANSYS® Mechanical and see all boundary conditions available. Here you can find out thermal boundary conditions and their properties.
You can define the initial temperature for your analysis in ANSYS® transient thermal as above. Click on the ‘Initial Temperature’ section then define your initial temperature as shown above.
This is also a very important step to obtain successful transient thermal analyses in ANSYS®. Step and time controls of each boundary condition provide the simulation of the real problem inside the ANSYS® simulation environment.
You can adjust the timing of each defines boundary condition in ANSYS® precisely with step controls.
From the ‘Solution’ section, you can insert required solutions to see after solving transient thermal analysis in ANSYS®. There are a bunch of solutions available such as ‘Temperature, ‘Total Heat Flux’ etc. as you see above.
Then click on the ‘Solve’ button to solve built transient thermal analysis in ANSYS®.
You can obtain ANSYS® analysis reports that are automatically created in ANSYS® if you wish. It includes very detailed information about the transient thermal analysis that you made in ANSYS®.
This article is created for educational and information sharing purposes with ANSYS® Academic license. Images used courtesy of ANSYS, Inc.
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