# Species transport:segragated vs.coupling

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 January 18, 2006, 13:34 Species transport:segragated vs.coupling #1 Jack Guest   Posts: n/a Hi, all There are two ways to model reactions using species transport equations.One is to obtain the flow field first, then disable flow equations and solve transport equations in a fixed flow field. Another way is to solve flow and transport equations simulatously. Can someone please explain the difference between the two ways. Will we get a same result via these two methods? Thanks Jack

 January 19, 2006, 01:20 Re: Species transport:segragated vs.coupling #3 Bak_Flow Guest   Posts: n/a Hi Jack, If the physics is segregated then solving one field like velocity and pressure and "freezing" it to solve the other "passive scalar" fields can be very economical. For coupled physics segregated or coupled methods should be able to get the same solution but the efficiency depends on how close the coupling is or more appropriately how close the "numerical coupling" is to the "physical coupling". Regards, Bak_Flow

 January 19, 2006, 11:40 Re: Species transport:segragated vs.coupling #4 Jack Guest   Posts: n/a Hi, Renato and Bak_flow. Thanks a lot for your replies, which are very helpful for me to understand the question. Renato: Could you please explain if(and how) the turbulence can significantly affect the results from segregated and coupled approaches? Bak_Flow: I am not quit clear of the two terms you used: physical segregated and physical coupling. Could you please clarify them with simple examples? Thanks again! Regards! Jack

 January 19, 2006, 12:18 Re: Species transport:segragated vs.coupling #5 Renato. Guest   Posts: n/a Well, let's say that in turbulent regime you'll have only an "averaged steady state" field. In this case it's hard to be sure about if your transported field would interfere (or be interfered) by the flow. regards Renato.

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