[pendyala]

Hello All,

I modeled a wind tunnel(Gambit)to capture the flow around pickup truck., Now when I want to add small adjustments to the end of pickup truck, the object I want to add is something like rear spoiler. I can't create a proper volume to run the flow again. The spoiler is connected through an edge to the body of truck. If I change the connecting area and create a volume, I can't mesh it, as the volume mesh and face mesh doesn't coincide.

error1: Cannot create an ACIS body with multiple shells.
error2: Check the skews of face mesh. (If I create a volume successfully).

[-mAx-]

pictures, please

[pendyala]

In the following pictures, I considered a basic model for my primary evaluation. If you observe at the end there is small device like a spoiler attached which is the reason I couldn't mesh. Without adding that device, I got little acceptable results to.

Thank you.

[pendyala]

After I add device and try to remesh, I get the error "check face mesh". Volume mesh failed due to improper face mesh.

[-mAx-]

Has your spoiler a thickness, or did you build it as a baffle (surface)?

[pendyala]

It has thickness. It is not exactly spoiler but a substitutional device we found through research. But very minimal thickness. Almost 2mm thickness .

[-mAx-]

then you have to split your domain with each surface from your device.
Doing this, you should see the device as hollow (just like your truck).

But as your geomtry isn't so complex, maybe you could restart from "0": Merge truck and device volumes.
Substract this result from your outer box.
On the mesh side, you could have skewness problem because of this minimal thickness. You just need to apply a size function (thickness as source)

[pendyala]

Basically, I tried to split my total domain into two so that I can have fine and coarse meshes. I am still uncertain of how the volume is simulated, if the inner volume is deleted from the outer domain.