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September 13, 2017, 15:53 |
Problem in simulation of toxic gas release
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#1 |
New Member
Bilal Waseem
Join Date: Mar 2014
Posts: 15
Rep Power: 12 |
Hi,
I am trying to verify the results of a research paper regarding simulation of toxic gas release. I am using Ansys Fluent Solver. Basically, first I ran a steady state analysis with wind blowing in a certain direction and certain velocity. Then I added a leakage source with mass flow boundary condition and ran a transient analysis for a gas release for 3 minutes duration (keeping the steady state results as initial condition). The result that I am looking for is mass fraction of gas at different locations in solution domain. At a height of 1.5 m from ground, the research paper plots its results for a fraction of 2.0e-5. My contour completely matches with the paper, except near the release point. In the paper, gas dispersion starts at the release point whereas in my case, gas releases disperses ahead of the release point in the forward direction with no dispersion along the plane of leakage source. So my results say that gas is not dispersing in the backward direction whereas in the paper, it disperses even behind the leakage source. In the attachment, the contours on the left are from the paper. I am simulation the case for wind speed of 0.75 m/s (contour No. 1). My results for the same wind speed are on the right. What could I be doing wrong? I have modeled everything as recorded in the paper. Please help. Last edited by billy7590; September 13, 2017 at 15:57. Reason: Forgot to add an attachment |
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September 13, 2017, 16:54 |
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#2 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,839
Rep Power: 73 |
I think that no one can say what is the reason of the difference without the details of the two simulations... Is the grid the same? Is the setting of the BC.s the same? Is the setting of the transient integration the same? Is the formulation the same?
I can only suggest to do also the comparison between the velocity fields |
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September 14, 2017, 10:17 |
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#3 | |
New Member
Bilal Waseem
Join Date: Mar 2014
Posts: 15
Rep Power: 12 |
Quote:
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September 14, 2017, 13:12 |
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#4 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,839
Rep Power: 73 |
The type and accuracy order of the discretization can also be a relevant difference.
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September 14, 2017, 14:12 |
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#5 |
New Member
Bilal Waseem
Join Date: Mar 2014
Posts: 15
Rep Power: 12 |
The paper that I am verifying does not give any information regarding discretization. Could you please shed some light on what type of discretization and accuracy selections will give better results ...??
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dispersion, fluent, gas |
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