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Creating Solid Sphere in middle of Pipe

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Old   May 15, 2015, 06:26
Default Creating Solid Sphere in middle of Pipe
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PRASHANT KULKARNI
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Hello FOAMers,
I am trying to make simulation of solid sphere in middle of pipe.The pipe size is 50mm diameter and 220mm length.

Need to put sphere in middle of pipe with diameter as 5mm.

Pipe geometry given for your reference.

Also please suggest Solver also.

Thanks,
Prashant
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Old   May 19, 2015, 03:13
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Al_th
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Hi Prashantcfd,

From my (small) knowledge of openfoam and CFD, you did not give enough information for people to help you.

What are you trying to achieve ? Do you want to look at the flow around a fixed sphere inside your pipe ? Do you want the fluid to act on the sphere to "push" it ? Do you want to move the sphere in the pipe and look at the impact on the fluid ?

In any case, here are some pointers for you :

- If you need to have a fixed sphere inside your pipe, this is quite easy.
  • Add your sphere in your pipe with your geometry/meshing tool
  • Get your sphere boundaries in a patch
  • Add the relevant boundary conditions to your 0/fields for the relevant patch
  • Use a solver adapted to your needs (laminar/turbulent, steady state or transient, there is plenty of documentation on the openfoam wiki)


- If you need to move the sphere and look at how it acts on the fluid, then you will need (Please correct me if I am wrong) dynamic mesh.
  • Add your sphere in your pipe using your geometry/meshing tool
  • Get your sphere boundaries
  • Add the relevant boundary conditions to your 0/fields for the relevant patch
  • Add a DynamicMeshDict file with the motion that you want to set up. Take care, depending on the motion, you might have mesh topology changes - wich means that some cells should be removed. You might have to give us more information in order to help you set up your dynamic mesh
  • Use a dynamic mesh solver. For example, in my current case, I use pimpleDyMFoam, which is the pimpleFoam solver that implement a solver for the dynamic mesh motion.
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Old   May 19, 2015, 12:03
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Howar
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Quote:
Originally Posted by PRASHANTCFD View Post
Hello FOAMers,
I am trying to make simulation of solid sphere in middle of pipe.The pipe size is 50mm diameter and 220mm length.

Need to put sphere in middle of pipe with diameter as 5mm.

Pipe geometry given for your reference.

Also please suggest Solver also.

Thanks,
Prashant
Hi friend. Could you give some help about the mesh since I also need to mesh a pipe but always failed with snappymesh
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Old   May 19, 2015, 12:32
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Saideep
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Hi there,

Well I can only answer a part of your question. I don't know which tool you use to remove the area of sphere for analysis. Basically I use Blender and it varies between people.
Now, you use snappyHexMesh and remove the spherical object present within the pipe to make analysis over the sphere. {if you are a beginner just use the motorbike example and change your locationInMesh point(NOTE: point mentioned is retained for analysis) within the snappyHexMesh file}.

To answer your second question is difficult as, if you are using two phases(interFOAM) -> I use interFOAM so I can recommend when to use it. But if you are just interested in injecting fluid and doing analysis maybe icoFOAM can do so. {guessing here correct me if I am wrong!!}
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