Learning Forum

[n2390n]

Hello, I'm facing a problem that other users have encountered.

Based on previous posts, I've noticed that other users have encountered similar issues. I've read through their posts, but I still can't seem to resolve the problem myself.

I checked the guidelines in Workbench. The handbook provides a formula that suggests users should use appropriate timestep sizes. However, I'm not sure about this cuz my results seem incorrect.(negative TEMP)

 

timestep ：20

 

 

A five-layer rectangular prism model (8000*1600*1 um) with a mesh size of 0.4 um, where the top layer provides heat flux.

 

and the initial temperature of the model is 22

.

 

And after confirming the material properties, there are no errors in the settings. Could anyone tell me where I may have missed something in the settings that led to results contradicting physical phenomena?

[Erik Kostson]

 

 

Hi

Except of using smaller time step (try that , so calculate dt time step as shown here : https://www.linkedin.com/pulse/calculating-solution-settings-transient-thermal-analysis-eric-stamper)

also the mesh and it size can influence.

See here for more info:

https://simutechgroup.com/transient-thermal-analysis-with-non-physical-temperature-results/

All the best

Erik

 

 

[n2390n]

hi, Erik：

are u suggest using different mesg sizing setting? 

this pic shows my setting for this case

[Erik Kostson]

Hi

I would suggest to really look through the posts in detail:

Mesh related: https://simutechgroup.com/transient-thermal-analysis-with-non-physical-temperature-results/

Time step related: https://www.linkedin.com/pulse/calculating-solution-settings-transient-thermal-analysis-eric-stamper

All the best and hope this info helps

Erik

[n2390n]

got it, thx alot

Will try it through