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How to simulate a fluid flow with solid particles mixed with them??

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Old   August 20, 2013, 12:59
Default How to simulate a fluid flow with solid particles mixed with them??
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pankaj bhatter
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I am a mechanical engineering student. i would like to simulate a flow which has the medium as fluid with small solid particles mixed with them for a research project. This multiphase medium will strike on walls of a cylinder and i need to find its impact on the walls. I dont have much knowledge about ansys and have just started working on it. So any sort of help would be appreciated.
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Old   August 20, 2013, 18:57
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Glenn Horrocks
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The CFX tutorial flow in a butterfly valve is an example of exactly this type of flow.
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Old   November 2, 2013, 14:02
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Quote:
Originally Posted by ghorrocks View Post
The CFX tutorial flow in a butterfly valve is an example of exactly this type of flow.
I tried the butterfly tutorial. But i was not able to proceed in my experiment further. My experiment is somewhat like this: A multi-phase solution flows through a cylinder and strikes a particular section of the cylinder. Due to this, the cylinder material will wear off a little bit and we need to find the final dimension of the cylinder, after the experiment. Can you guide me on how to proceed further in ANSYS??

Any help is highly appreciated.

Regards,
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Old   November 2, 2013, 23:52
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If you are looking for a model which then couples the wear rate to erode the object, change its shape and then continue the simulation with the new shape - well, that is a very challenging simulation and one which cannot be done with the default models available in CFX. You are going to have to develop this yourself.

You can probably do a simple version where you run it for a while and get the wear distribution, then you remodel the object manually with the wear rate and then mesh it and simulate it again. This sounds quite simple, but it manual and time consuming.

On second thoughts - you can probably do this using the parametric modelling in ANSYS workbench, where you couple the predicted wear rate back to the geometry and let it progress. This will probably be a better way of doing it. But it will still be a tricky model to develop.
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Old   November 4, 2013, 02:14
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We can do it manually, even though it would be time consuming. But, the main problem is that how can we measure the final dimension of the work-piece after the simulation and how can we specify the material of the work-piece, because there should be different erosion rates if the work-piece material is steel as compared to the situation where the material is aluminium.

The butterfly valve tutorial also doesnt specify the material of the valve.

Thanks in advance.

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Pankaj Bhatter
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Old   November 4, 2013, 05:28
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Did you read my last post? Let me quote it again:

Quote:
(It) cannot be done with the default models available in CFX. You are going to have to develop this yourself.
If you are looking for a "simple" solution then you will not find one. Other software might be able to do it, but not CFX.
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Old   November 4, 2013, 08:36
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Quote:
Originally Posted by ghorrocks View Post
Did you read my last post? Let me quote it again:



If you are looking for a "simple" solution then you will not find one. Other software might be able to do it, but not CFX.
I think that you only pointed out the simple version of doing it manually.

Quote:
You can probably do a simple version where you run it for a while and get the wear distribution, then you remodel the object manually with the wear rate and then mesh it and simulate it again. This sounds quite simple, but it manual and time consuming.
Since i am a amateur in ANSYS, i wanted to do it the manual way. Again specifying the original question, how can i give material to my work-piece in ANSYS and how can i measure the final dimension of the work-piece after i am done with my simulation??

It would be great if you or someone else would provide a direction in the above regard.
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Old   November 4, 2013, 19:19
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One method which sounds plausible was in post #4:

Quote:
you can probably do this using the parametric modelling in ANSYS workbench, where you couple the predicted wear rate back to the geometry and let it progress. This will probably be a better way of doing it. But it will still be a tricky model to develop.
Have a look at the parametric modelling stuff in workbench to get a feel for this. There are tutorials on parametric modelling (but not erosion modelling of course) on the ANSYS customer page.

The butterfly tutorial with the erosive particles shows you how to get the erosion rate density. You are going to have to use that with some material properties to get erosion rates.
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