My fluide is going in the wrong sens!

Using SimScale
1

Hello everyone, I am a young french guy who just started.

I’m trying to model the aerodynamic resistance on a 3d model that I drew, but I have a big problem, my fluid (air) is moving in the opposite direction!

I have tried reversing the exit and entry faces, giving a negative speed to my displacement speed but none of these solutions work, do you have any advice?

I’m following this tutorial with my own 3D model :

and here is my current result, as if the car was going backwards which is rather uninteresting :slight_smile:

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image1920×831 139 KB

2

Hello pbainier,
thanks for reaching out to us here in the forum.

Can you please share a link to your project with us so that we can have a look at it ?

Best regards
Sebastian

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3

i try to find how :wink:

thanks for your interested

4

i send it to you :slight_smile:

5
6

Please just compy and past the URL of the project here in the Forum :slight_smile:

7

hi please not that the values you enter for the velocity components are considered in the positive axis. You can see the direction of the axis in the bottom right corner.

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image1657×877 59.8 KB

So for this case the right setup would be.

Surface 1 as velocity inlet with -20 m/s in the x direction.
Surface 2 as pressure outlet.

Also please make sure to enter -20 m/s for the road aswell.

Best regards
Sebastian

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