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[AravindReddy]

Hello Everybody ,

I am unable to reduce skewness angles at my trailing edge of s809 airfoil after applying inflation. I Have an 3D c-grid domain with s809 airfoil in the center. 

[Karthik Remella]

Hello,

My first thoughts would be to try and use the Fluent Meshing for Watertight Geometry Workflow to generate a good mesh. With this tool, even though the mesh is unstructured, you have really good control over the quality of the mesh. 

Also, are you working on a 2D simulation? Or is this 3D? As Ansys staff, we are not able to download models shared as attachments on the community. Please share some detailed images of your geometry so we can better understand what you are modeling.

Thanks.

Best,

Karthik

[AravindReddy]

 

I am Working on 3D simulationn. Unlike, most of the examples in youtube my airfoil is at a certain distance from both front and rear planes in my domain. Most of the examples in internet has the airfoil extruded out from front plane to rear plane.

Please help me in reducing skewness angles at the trailing edge .

Thanking you

Aravind Reddy Goulla

 

[Karthik Remella]

Hello,

Could you please try using a body of influence around your airfoil and reduce the mesh size in the vicinity? This might help alleviate some of the skewness issues you are seeing. The basic idea is that you create a region near your airfoil and refine your mesh. Outside this region, you can get away with a relatively coarser mesh. This might help resolve the issue. 

Thanks.

Best,

Karthik

[AravindReddy]

Hello Karthik ,

Thank you for your replies.

I had already tried this idea. but unfortunately the angles at the trailing edge are still near to one .

 

Thanking you 

Aravind Reddy Goulla

 

[Keyur Kanade]

Trailing edge has very sharp angle. The first layer height of prism layer is very small. With this combination, you will get skewed elements. 

With the trailing edge, you may need some modification. You may need to cut a small part of the trailing edge to avoid that sharp angle. 

Another option is to get full hex mesh. You can find a video on youtube on creating hex mesh for airfoil. 

Regards,

Keyur

 

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[AravindReddy]

Hello Mr. KKanade,

I have tried cutting the trailing edge, but the skewness angles are one still at the trailing edge and i cannot reduce my first cell height since i need it for desired y plus value. 

Can you share the hell mesh link here . If it is the ICEM solver hexmesh i have tried that too but failed.

 

 

 

[Keyur Kanade]

Can you please insert image of the modified trailing edge?

I can not share third party links. You can always search on net. 

Regards,

Keyur

 

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[AravindReddy]

this is how my trailing edge looks after cutting

 

[Keyur Kanade]

This looks good. 

Did you check the locations where skewed elements are?

Please check orthogonal quality. The min should be above 0.1. 

Please search on community, you will find the threads with how to check quality in meshing. 

Regards,

Keyur

 

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[AravindReddy]

The location of skewed elements are at the  trailing edge only.

The min orthogonal quality in my case is 4.0572e-005 which are also at the trailing edge

[Keyur Kanade]

Can you please insert image of bad elements with min orthogonal quality below 0.01. 

Make sure that you atleast have 3-4 elements across the trailing edge cut. 

Regards,

Keyur

 

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[AravindReddy]

I Solved the problem by blending the trailing edge.

is it the right method to approach ???