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October 18, 2010, 10:42 |
Help: operating pressure for deflagration
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#1 |
New Member
Join Date: Mar 2009
Posts: 19
Rep Power: 17 |
Hello, everybody,
I am doing simulation of deflagration in a tunnel (flame propagation of premixed mixture). The mixture is ignited at one closed end of the tunnel. First, the Mach number <0.1, however,the flow velocity increase fast with time, and the Mach number also increase to a number larger then 0.1. The reaction flow is treated as compressible flow. The problem is how should I set the operating pressure in FLUENT6.3.26? It's suggested in Fluent that when Mach number <0.1, operating pressure=mean flow pressure, while when Mach number >0.1, operating pressure=0 or mean flow pressure. So what can I do.? By the way, I use the density-based solver, so I can not use the floating operating pressure. Thanks very much! Last edited by fireman; October 18, 2010 at 11:54. |
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October 19, 2010, 10:07 |
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#2 |
New Member
sreenivasa rao gubba
Join Date: Sep 2010
Location: Leeds University, UK
Posts: 28
Rep Power: 15 |
Hi
check if you can overide by writing an udf in fluent? It is my guess only. Sree |
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October 19, 2010, 10:14 |
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#3 |
New Member
Join Date: Mar 2009
Posts: 19
Rep Power: 17 |
hi, Sree
Thank you. but I can not find the udf choice of operating pressure. |
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October 19, 2010, 11:01 |
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#4 |
New Member
sreenivasa rao gubba
Join Date: Sep 2010
Location: Leeds University, UK
Posts: 28
Rep Power: 15 |
hi Fireman
Can you clearly define, what do you mean by operating pressure. Do you want to set the entire domain at a pressrure equal to the experimental pressure? Do you want to devide your domain and setup two different pressure? Just eloborate a bit please. Sree |
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October 19, 2010, 11:43 |
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#5 |
New Member
Join Date: Mar 2009
Posts: 19
Rep Power: 17 |
hi Sree,
The operating pressure in fluent is used to reduce the roundoff error for low-Mach flow. I want to setup the operating pressure equal to the mean flow pressure of the whole domain. Or I need setup the operating pressure=mean flow pressure when Mach No.<0.1, operating pressure=0 when Mach No.>0.1 Now I don't know how to realize either of the two settings described above. Thank you very much |
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