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#1 |
New Member
wind
Join Date: Feb 2012
Posts: 16
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Hi, I would like to model the emission from the vehicle into the environment. May I know how to define the material which consists of NO, SO, CO and Particulate matter ?
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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How you model it depends on what you are trying to achieve with the model. You can model it by a simple additional variable approach (simple, easy but does not account for variation in material properties due to composition changes) through to multi-component mixture models and multiphase models. What approach is appropriate depends on what you are trying to do.
So can you explain what you are trying to do, and why you are doing this?
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#3 | |
New Member
wind
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Quote:
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
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You should be aware of the various modelling options and their implications - that way you can make the decision yourself with confidence. So read up in the documentation about the options so you understand them.
But if I guess what you are doing and trying to achieve, I would suspect material property effects and chemistry are not important in your case, so a simple additional variable approach would work well. To do this, add an additional variable; and in the domain set the additional variable to have a diffusive transport equation. So the only material property you need to define is the diffusivity of the material in air. Note that the diffusivity is just the molecular diffusivity and will be increased by any turbulence model - meaning that for most models the molecular diffusivity is irrelevant as turbulence is dominant. This means you can probably ignore diffusivity if your turbulence is high enough.
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#5 | |
New Member
wind
Join Date: Feb 2012
Posts: 16
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Quote:
Hi, Ghorrocks thank you for your advice. |
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