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-   -   CFX and Transient Thermal Results (http://www.cfd-online.com/Forums/cfx/115292-cfx-transient-thermal-results.html)

bhavik139 March 27, 2013 13:57

CFX and Transient Thermal Results
 
I used transient thermal and CFX with same setup but I am getting differences in the results. So can anyone guide me regarding this. Actually I want to use the thermal results in Transient structural to determine thermal stresses.

ghorrocks March 27, 2013 17:57

FAQ: http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F

bhavik139 March 27, 2013 23:44

No I am not getting errors in the results but the results are not matching.

ghorrocks March 27, 2013 23:57

So, you have an inaccuracy between the ANSYS and CFX simulations, right? Then the FAQ I quoted is the place to start.

jthiakz March 28, 2013 03:47

# provide the CFX case setup / result details clearly
# how much the deviation is, which parameter is deviating

bhavik139 March 29, 2013 00:31

4 Attachment(s)
I have attached the CFX setup, I am getting the value of max temp different in both cases.
Attachment 20240

Attachment 20241

Attachment 20242

Attachment 20243

evcelica March 29, 2013 15:04

Is everything the same on both simulations, initial conditions, material properties, geometry, etc?
Have you reached a grid independant, and time step independant solution with both simulations. How did you pick your timesteps? Are you converging each timestep in CFX, and if so to what residual level?

Are you sure you put in the same boundary conditions in mechanical, the timesteps can be a bit tricky sometimes, especially when entering a function for multiple time steps.


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