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Old   January 24, 2001, 07:07
Default Geometric Modelling problems
  #1
V.Kiran
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Dear sir/Madam, I am working on fluent for the past 10 months.In this period i mainly dealed with 2-d problems.Now i am working on a three dimensional problem.I am founding some difficulties in modelling the problem.So kindly give your suggetions for the problrm which is described in brief here after... My problem is a sparger tube which consists of 1000 holes around its surface. 1)How to create holes on the surface of the cylinder directly.Here i am following some method of splitting and uniting for creating holes on the cylinder surface. i want to know whether any direct method is there in Gambit. 2)Second thing is i had to insert the cylinder with holes into an other cylinder.Here i am finding the mesh problems.So kindly suggest the meshing criteria for the problem. Waiting for your response.... Thanking you, V.Kiran, FCRI,Palakakad.
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Old   January 24, 2001, 11:55
Default Re: Geometric Modelling problems
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Sandeep
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I did it this way (may be there is a better way to do it)

1) Create a vertical cylinder +Y direction (which is basically your sparger tube)

2) Create a horizontal cylinders (Z centered) which has a diameter = hole diameter that you want on the tube and length which is > than the diameter of the cylinder created in step 1. Move this cylinder in + Y direction to whatever location you want your 1st row of holes on the sparger to be.

3) Split 1 with cylinder 2 (Bi-directional split). Unite the middle cylinder that is created a as a result of the split with the cylinder in step 1.

4) Delete the side cylinders (uncheck the lower geometry option so that you keep the face)

5) split volume option: take the cylinder in step 1 and split it with the faces created in step That way u create the sparger holes. Repeat this procedure along the circumference and along the length of the cylinder in step 1.

There might be a better way to do it. Any suggestions ?
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Old   January 29, 2001, 00:57
Default Re: Geometric Modelling problems
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V.Kiran
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Dear Sandeep, Thank you very much.I had also followed the same method to create holes on the cylinder.I also requested you one more question about mesh criteria... Here i am giving the details.... After creating the sparger tube with thousand holes, i should insert that sparger tube in a cylinder which is 4 times the dia of sparger.... My doubt is how i should mesh the above problem, i mean what is the step by step criteria.Here i had been tried with different methods where i couldn't suceed to mesh.As meshing is the important step for all fluid dynamics problem, kindly give your suggestions..... Thank you very much for your previous response... Bye, Kiran
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Old   January 29, 2001, 09:16
Default Re: Geometric Modelling problems
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Sandeep
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I dont think you have a whole lot of options. tet mesh would be best bet considering you have thousands of holes on your sparger tube.
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