Learning Forum

[diegorod]

Hello everyone. I'm stuck in the middle of a problem with Ansys Meshing. The thing is that I'm trying to mesh a 90 degree pipe bend (3D)  and I get problems when introducing inflation. As you all can see, close to the bend I get no problems without inflation, but introducing this option I get a transversal "distorsion" (The lines perpendicular to the flow direction are not parallel) Thank you

 

[diegorod]

Here there is no problem

 

[diegorod]

 

 

But here is the problem

[peteroznewman]

Go into DesignModeler, create two planes and slice the solid body into three pieces, the two straight pipes and the elbow. Select the three pieces and Form New Part to make a multi-body part that will have mesh connectivity.  Then apply the inflation and the elements on the bottom can easily be made with no skewness.

[diegorod]

After spliting the body in three and creating the part, i reduce the distorsion but the inflation has started to behave in a strange way

[diegorod]

The error says "the meshing has completed, but some elements are not compliant with the applied shape checking criteria"

[peteroznewman]

Delete the Multizone mesh method and the Inflation mesh controls you have.

Under Mesh insert a Mesh Control Method and set the type to Sweep. Select just one straight pipe for the body. On the Source face, select a circular end face.

Now RMB on the Sweep mesh control and select Inflate this Method. It will automatically light up the end face that is the source. Now select the circular edge.

Generate Mesh. I think the Multi-body part will carry that sweep to the other two bodies without applying any mesh control to them. Try that first. If it doesn't work, you can repeat the mesh control on the other two bodies.

[diegorod]

The sweep method doesn't let me select a face boundary when inflating the method

[peteroznewman]

You don't select a face for the boundary, you select the circular edge.  The object you are applying the inflation to is the end face of the cylindrical solid. It will sweep the 2D mesh on the end face along the pipe.

[diegorod]

This is what I get

I see your point about "sweeping" the face mesh along the pipe, but the results I get are not the ones that can be expected

[peteroznewman]

Looking at the big circles around your cursor, your default element size is about 100 times too large. Try again with different settings under Mesh Details.

[diegorod]

It works now, I didn't know about the importance of it. No split bodies were required, only adjustment of sweeping and inflation.

Solved.

Thank you so much!!