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Baffle cell problem in shock tube

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Old   November 14, 2004, 13:47
Default Baffle cell problem in shock tube
  #1
AB
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Hello,

I am trying to run a shock tube model, with a tube divided into 2 sections and each section is defined as different material( though air in both) but with different pressures and temperatures. I have given them stagnation inlet BCs and and pressure outlet BCs and slip walls and symmetry BCs on rest of the sides accordingly. I have also initialised the pressure and temp through Nav center from the initialisation option for different material.

Here all checks are completed without any errors but when I write the geometry file I get this error in the model::

Error 5 - "Adjacent cells are in different fluid streams and not seperated by a wall or baffle. "

This is where I dunno whether I need to specify baffle cells or not in the interface.

Also if I specify baffle then, it will become 2 seperate regions and there might then be no interaction between different fluid streams.

waiting for anyone's response...

I am sure many people here have done shock tube problem using star-CD and I want to get some tips and tricks .

Thanks,

AB
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Old   November 14, 2004, 14:04
Default Re: Baffle cell problem in shock tube
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Brian
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Your problem is that you have used two different materials. Materials are not allowed to mix, they must be in separate streams or be solid / fluid.

Specify the air in both sections as the same material, and problem solved. You would have to use user coding or perhaps tables to initialize.
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Old   November 14, 2004, 16:32
Default Re: Baffle cell problem in shock tube
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AB
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Hello Brian,

Still it is not working. I am getting all 0 values in my run and it says there are some warnings in .info file.

If u have time then please send me your email id so that I can send you the model file in zip format for you to just look into it as it is some simple error which I am not able to take care of.

Will be waiting for response,

Thanks,

Arnab
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Old   November 15, 2004, 02:51
Default Re: Baffle cell problem in shock tube
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Brian
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You should be sending it to your local support office for help.
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Old   November 15, 2004, 09:44
Default Re: Baffle cell problem in shock tube
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Anton Lyaskin
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Hi Arnab

You have to use different cell types and one material. To assign different initial temperature and pressure basing upon different cell types you'll have to use user subroutine INITFI

Regards, Anton
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