March 23, 2023 at 5:31 pmPRAJVAL PRASAD INAMDARSubscriber
I am performing thermomechanical fatigue analysis of exhaust manifold. For that I want to run the fluid simulation for bigger time step so that a steady state temperature is achieved for that time step. Then I want to give that temp profile to thermal model having less time step to get the thermal stresses induced. Can I do this in ansys ? Ani if yes how should I proceed? Also can I add temperature dependent properties of material as at high temperatures of exhaust the properties change drastically? Please help. I shall be obliged.
Thanks in advance.
March 27, 2023 at 12:55 pmRMAnsys Employee
Is it a 1-way or 2-way analysis?
Time Step Size and Number of Time Steps for fluent are controlled by system coupling, so the values specified in fluent are ignored.
If it is 2-way, refer 42.5. System Coupling Related Settings in Fluent (ansys.com) and System Coupling Related Settings in Mechanical (ansys.com) for settings required as inputs in both participants.
March 28, 2023 at 5:39 amPRAJVAL PRASAD INAMDARSubscriber
It's a 2 way fsi. I was to make the fluent come to steady state and then transfer that data to thermal. I want have time step of fluent to be less than thermal (say 0.001 fluent and 0.01 for thermal) and I want to couple them. Basically I want that after some iterations of fluent then only thermal should start calculation.
March 30, 2023 at 8:18 amRMAnsys Employee
You might want to refer to Steady-Transient analysis Transient Analysis Type (ansys.com)
In such steady-transient analyses, System Coupling will show the overall analysis type as Transient, while the physics with the shorter/faster timescale is solved as steady-state.
June 2, 2023 at 10:45 amEden WheelerSubscriber
Yes, you can perform the thermomechanical fatigue analysis of an exhaust manifold in ANSYS. To achieve a steady-state temperature profile for a larger time step, you can run a fluid simulation using a transient solver until the temperature stabilizes. Once you have the steady-state temperature profile, you can export it and import it into a thermal model with a smaller time step.You can also check this: aws certified developer course
To proceed, follow these steps:
- Set up and solve the fluid simulation using a transient solver in ANSYS Fluent or a similar tool.
- Monitor the temperature until it reaches a steady-state condition.
- Export the temperature profile from the fluid simulation at the desired time step.
- Set up a thermal analysis in ANSYS Mechanical or a similar tool, using the imported temperature profile as a boundary condition.
- Run the thermal analysis with a smaller time step to obtain the thermal stresses induced in the exhaust manifold.
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