CFD Online Discussion Forums - [ICEM] suggestion for blocking strategy and meshing a corner

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- - [ICEM] suggestion for blocking strategy and meshing a corner (https://www.cfd-online.com/Forums/ansys-meshing/125794-suggestion-blocking-strategy-meshing-corner.html)

Quote:

Originally Posted by Far (Post 461102)

Steps are:

1. Make the initial block

2. Make one horizontal spilt

3. Make 4 vertical splits. One is at the end of ramp and other few units before it.

4. Delete the block in lower right corner

5. merge vertices at the end of ramp and now you have wedge block

6. Go to y-block command apply on it

7. Make associations

8. Again select all blocks, faces on two sides of your geometry (symmetry) and other faces where you don't want O-grid

9. Smooth mesh in wedge block, but be careful using parameters for smoothing.

If you use 2D blocking, Y Block from the panel cannot be used. It is tricky to do it. You need go to the Ogrid splitting, now selecting two edges to create a Y block. Remember, when you select no edge, you get an Ogrid. When you select one edge, you get C grid. When you select two edges, you get Y grid. When you finish the Y block splitting, the raw blocking may have redundant parts, so use merge block etc to make it nice.:)

Quote:

Originally Posted by Far (Post 461102)

I have tried your method, but with out boundary layer part which I was not able to produce like the one you have provided.

The convergence is now smoother and the minimum quality is equal to 0.892.

but mesh density near the corner is a problem in my unsteady simulation.

I have to decrease the time step just because of that region!

this is almost similar to what i did. Only difference is that I made one extra split before Y-grid. Now you can apply ogrid to improve solution accuracy and convergence. Or you can make ogrid first and then merge vertices and Yblock.

why you are solving 3d problem?

Quote:

Originally Posted by Far (Post 461402)

It is not actually a 3D problem, I am using OpenFOAM and as you know it only works in 3D. So any geometry must have 3 dimensions. However if we only need to solve a problem in 2 dimensions, defining the planes perpendicular to the third direction as "empty" type, will do the job.

Quote:

Originally Posted by Far (Post 461402)

I have tried to add the boundary layer part to my previous mesh. Is there any suggestion to improve it even further?

thanks in advance

you did first O-grid and Y-grid? Seems so!!!. Now its perfect :D

Quote:

Originally Posted by Far (Post 461616)

you did first O-grid and Y-grid? Seems so!!!. Now its perfect :D

yes...

1- I have done vertical and horizontal splits as you suggested.

2- I have removed the block at lower right corner.

3- I have applied the O-grid.

4- a little playing with merge & move vertices to make it nice.

5- Then I have applied Y-block

many thanks for your help;)