# 3D Meshing

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• Last Post 03 March 2019
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RajuMath posted this 24 January 2019

Hi,

How can I generate good meshing in 3 D geometry. My target is hexa mesh with uniform size.

My geometry is Lance with nozzle in a converter.

Thanks,

Raju.

peteroznewman posted this 03 March 2019

Hi Raju,

When I say, "keep slicing until you have only bodies with exactly six faces", that was not a recommendation, just an answer to the question. There are so few prisms, it is not worth the effort.  The slicing is in any direction that accomplishes the goal. The slicing might even be on cylindrical surface, not just planes. It doesn't matter how you make a plane. What ever is easier. Once you have a body with exactly six faces, it will be sweepable and you will use Method Sweep. You set the 'number of divisions' that are appropriate, or let the mesher decide for you.

Regards, Peter

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RajuMath posted this 03 March 2019

Hi Peter,

I will slice the body horizontally, right?

For slicing which option is better, 'Point and normal' or plane?

After slicing should I use multizone option? What do you suggest about the use of 'number of division' option in my geometry case?

Thanks,

Raju.

peteroznewman posted this 03 March 2019

"What was the reason that bottom part was not meshing?"  I didn't look at the initial mesh.

"Just unsupressed the all bodies?" Yes.

"In the meshing, there are some prism meshed can be seen. Are there any option to remove this?"  You can keep slicing until you have only bodies with exactly six faces.

"For good aspect ratio, is it enough to reduce maximum element size? "That is one way to achieve better aspect ratios.

"I made two body because  I want to flow gas through lance."  I recommend you make two separate models. One for the flow inside the lance where the nozzles are outlets.  A second model for the flow in the tub where the nozzles are inlets.

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RajuMath posted this 03 March 2019

Hi Peter,

Thank you for your instruction. What was the reason that bottom part was not meshing?

You have done for 1 body meshing. For full domain, what should I do? Just unsupressed the all bodies?

I made two body because  I want to flow gas through lance, I have to set Inlet at Lance. For Boolean subtract, how can I define Inlet named selection at Lance?

In the meshing, there are some prism meshed can be seen. Are there any option to remove this?

For good aspect ratio, is it enough to reduce maximum element size?

Regards,

Raju.

peteroznewman posted this 02 March 2019

Hi Raju,

Why are there two bodies?

I changed the Boolean to not Preserve Tool to end up with one body, then I used slice on 3 planes to do 1/6 of the mesh.

Regards, Peter

ANSYS 19.2 archive attached.

Attached Files

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RajuMath posted this 02 March 2019

Hi Peter,

Regards,

Raju

RajuMath posted this 01 March 2019

Hi Peter,

Extremely sorry for late reply. I am facing some problems in meshing. Lower part of geometry is not identified in meshing. Can you please see the attach file and give me some instructions for hexa meshing. I need some dense mesh below the nozzle and lower part of the geometry.

Regards,

Raju.

peteroznewman posted this 29 January 2019

Hi Raju,

Please insert some images of your geometry into your reply to show the 5 blocks. Theses are blocks of fluid, right? If you attach a Workbench project archive .wbpz file, I can take a look at the mesh you have currently (but Clear Generated Data on the mesh on your computer then save and I will Generate Mesh on my computer) and offer suggestions.

Regards, Peter

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RajuMath posted this 29 January 2019

Hi,

Suppose my geometry have divided to 5 blocks. If I mesh one block of my geometry then other blocks will be meshed automatically. Are there any option in ANSYS like this?

For making block in Geometry, Usually I use plane using point and normal and then slice the geometry by new generated plane. So whole body divided into 2 parts. I used this in 2D. Is this method suitable for 3D? Are there any other options to generate block for good meshing?

Raju.

kkanade posted this 29 January 2019

what is projected hexa meshing? can you please explain in details.

did you look at following link.

https://caeai.com/resources/tips-tricks-hex-brick-meshing-ansys-e-learning

RajuMath posted this 28 January 2019

Hi,

How to do projected hexa meshing?

kkanade posted this 24 January 2019

check following lniks.

https://caeai.com/resources/tips-tricks-hex-brick-meshing-ansys-e-learning

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