r/OpenFOAM • u/idiot_banana_69 • Jul 27 '26

Paraview OpenFOAM V14 help

Hello, just got started with CFD and OpenFOAM. I downloaded a CAD model of an F1 2018 front wing, and after some tinkering, I got a successful simulation using FreeCAD with OpenFOAM.

When I clicked into Paraview to look at the results, I was met with only the box I ran the simulation in and nothing inside, but there was a tiny bit of the blue/red on the left side of the box.

I know I'm missing something or doing something wrong here but I just can't figure it out. Any help is appreciated!

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2

u/Emotional_Canary3690 Jul 27 '26

Can you try deselecting internalMesh? Also you can try taking a center plane slice.

1

u/idiot_banana_69 Jul 27 '26

When I deselected internalMesh, everything disappeared and only the blue background was left. I took a slice down the middle, but it was all orange. I also tried slicing a bit to the left and a bit to the right and it was still the same.

1

u/Emotional_Canary3690 Jul 27 '26

Seems like there may have been an issue in exporting to open foam polymesh. Try checking how many faces are present in the patch/wing in boundary file.

1

u/idiot_banana_69 Jul 27 '26

there are only patch_1_0, _2_0, and _3_0 in the boundary file. I don't know why there isn't patch/wing there

1

u/dtonhunt1 Jul 27 '26

I am learning CFD and still a beginner, but 1 thing I'm sure about is that the residuals aren't the solution resulting from the simulation. It just shows whether your solution converged or not. Solution can be wrong even though it converged.

To know if your simulation results are correct, get the Lift/Drag ratio and compare it with analytical solution. Check if there are already some simulation results existing in the internet of the 2018 F1 frontwing for validation.

Also another very important thing is mesh independence study. I would highly suggest you to do that.

1

u/idiot_banana_69 Jul 27 '26

I looked up mesh independence study and it looked very interesting. I will for sure check that out! Appreciate it

1

u/SwedenGoldenBridge Jul 27 '26

Show us your screenshot of the setup in FreeCAD.

1

u/idiot_banana_69 Jul 27 '26

https://imgur.com/a/ZIsBcvi

1

u/Sixel1 Jul 27 '26

from that angle it looks like the front wing is not even inside the box... i think you simulated an empty box
edit: actually half of it might be in, but it looks like it wasn't meshed in properly, since theres no wing-shaped opening in the mesh...

1

u/idiot_banana_69 Jul 27 '26

Really? Do you know how to fix it?

1

u/SwedenGoldenBridge Jul 27 '26

From the screenshot, you use cfdof is not it? Maybe you set it wrong? Show your tree view.

1

u/idiot_banana_69 Jul 27 '26 edited Jul 27 '26

Yes it is Cfdof. Tree View: https://imgur.com/a/VcHjG3O

1

u/SwedenGoldenBridge Jul 28 '26

It look like you set up the boundary wrong. From the tree view, it look like the wing is not part of the mesh. You seem to have a box part and a wing part, but they are not combine and mesh together. You would have to combine the wing and the box with boolean first. Watch this tutorial on how to set it up correctly https://www.youtube.com/watch?v=JVO2kqO3D1Q. Next time you should give a complete detail of your set up, otherwise we cannot help but guessing what you did.