SimScale CAE Forum

Step-by-Step Tutorial Session 2 - Full Car Aerodynamics (Part 2)


#24

Hey @yaelsky,

The error you have is normally related to mesh quality. I went over your settings and it looks like you changed one by accident. Use ‘feature refinement’ for snapping? should be turned to false. Rerun the mesh and re run the simulation and let me know if it works. At the end of the Meshing Log you should have 41 illegal cells.

Screenshot_2017-09-28_10-29-37

Hope this helps!

Diego


#25

Thanks a lot it worked!


#27

I have the same problems as some of the other users when it comes to the simulation. It says that (The job execution was aborted, possibly due to a numerical instability. Review the log to identify reasons: nonphysically large field values, extremely small time step size, etc. Modifying numerical settings and time step size could resolve the issue.) I have checked the solutions you have written before but they do not work for me. Could you please check my project: https://www.simscale.com/workbench?publiclink=d6a7307a-2119-4c3a-99f5-2e4ec0d564dc

Thanks a lot


#28

Hi @Zaapex!

Have you counter-checked everything @drodriguez32 mentioned in this thread? Is you still have issues please let me know. Trying to help you there!

All the best!

Jousef


#30

I have found some issues and I think I fixed them. So no need for help now.
Thank a lot
Zaapex


#31

I face the same problem. Please tell how you solved it.
https://www.simscale.com/workbench?publiclink=6cab5689-6343-4591-ba0d-a735ed7578e7
This is my link,
Thanks a lot


#32

The problem was with the mesh, I did’t set it correctly (just went through the instructions once again).


#33

Hi, Im wondering how can I get a Pressure Drop plot for the radiator just like pics in the tutorials result analysis


#34

Hi @czhang!

You can create an Area average result control item, select the “inlet & outlet” and then can visualize the pressure difference in the post-processor.

Best,

Jousef


#35

I remeshed the geometry. There seems to be a problem with geometry itself. The mesh log mentions:
Illegal triangles were found after surface tessellation. There could be a problem with the CAD geometry. Trying to proceed anyway.
The tessellated surface was not closed. There could be a problem with the CAD geometry (such as self-intersections). Please inspect your geometry. Trying to proceed anyway.


#36

Hi @TusharSimScale!

This should be no problem for this case because the geometry has been tested already. What issues did you have for your project?

Best,

Jousef


#37

I receive the message as follows:
The job execution was aborted, possibly due to a numerical instability. Review the log to identify reasons: nonphysically large field values, extremely small time step size, etc. Modifying numerical settings and time step size could resolve the issue.
The default time step size is 1500. If I increase it shows:
No data will be written since the write interval is too large. Please choose a shorter write interval.
I am only able to decrease the time interval but it shows the former error again.


#38

Please share the project link with me @TusharSimScale!

Will have a look at this.

Best,

Jousef


#39

https://www.simscale.com/workbench?publiclink=bad01686-5332-46fe-8512-e636c3c6d818
Thank you


#40

Hello! I can’t find Gradient scheme for grad§ in my numerical schemes when setting up the simulation, what could be the problem?


#41

Hi @tcortez!

This is probably a typo. @drodriguez32 meant “Gradient scheme for grad p”. Changed it.

Best,

Jousef


#42

I assumed it was, luckily I assumed correctly! Thanks for fixing and clearing this up!


#43

Hi there!

I’m currently finding some problems to post process the results of my simulation. When I’m creating a slice I cannot select velocity/pressure field, the only option available is solid color and then I don’t any result. I’ve tried a few times to restart the post processor but it keeps the same problem.

Here is my public project link.
https://www.simscale.com/workbench?publiclink=a21852dc-15be-4fb2-8430-b5582d6b70bc

Thanks,
Andre


#44

Hello,

I have a small problem. While visualising pressure contours on the car body, I have a lot of high pressure regions as compared to this.

Blockquotehttps://www.simscale.com/forum/uploads/default/original/2X/2/210e91ba497293659c2967d11f87367075058a74.jpg

Also, my velocity on radiator slice is a bit different from what is shown in thetutorial.

I’m attaching a link to my public project. Can someone have a look at it?

https://www.simscale.com/workbench?publiclink=3215b44b-c4d6-420a-adf1-ff07b56650cc

Regards,
Kshitij


#45

Hi @AndreCosta!

For me everything worked perfectly fine copying your project into my Workspace. Can you try going through the steps again please and see if you made a mistake? Let me know how things go!

Best,

Jousef