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Old   June 14, 2018, 07:21
Default Convective terms schemes
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Khaled Ahmad
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What is the most common differencing scheme used for convective terms recently?

The cases are sudden expansion and a flow over cylinder. The flow is incompressible.

Using FV method and RANS
The grid is non-orthogonal non-staggered structured
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Old   June 14, 2018, 07:56
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Originally Posted by kh.aa View Post
What is the most common differencing scheme used for convective terms recently?

The cases are sudden expansion and a flow over cylinder.
The grid is non-orthogonal non-staggered structured

Considering only incompressible flows, I can suggest using FV formulation to fulfill conservation of mass and momentum. Often the type and order of the discretization depends on what formulation you use (RANS/LES/DNS).
You should provide more details about your interest
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Old   June 14, 2018, 08:07
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Considering only incompressible flows, I can suggest using FV formulation to fulfill conservation of mass and momentum. Often the type and order of the discretization depends on what formulation you use (RANS/LES/DNS).
You should provide more details about your interest
Thanks for your reply and sorry, I was not clear.

I am using FV with RANS formulation and the flow is incompressible.
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Old   June 14, 2018, 08:09
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Thanks for your reply and sorry, I was not clear.

I am using FV with RANS formulation and the flow is incompressible.



In this case you do not need high accuracy order provided by recent advanced discretizations and also upwind schemes can be used.
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Old   June 14, 2018, 08:17
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I see. I was intending to use the Upwind scheme.
I was afraid that this will affect the accuracy.

But can you please state the reasons that no need to use higher order schemes for such conditions?

Thanks
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Old   June 14, 2018, 08:22
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I see. I was intending to use the Upwind scheme.
I was afraid that this will affect the accuracy.

But can you please state the reasons that no need to use higher order schemes for such conditions?

Thanks

The contribution given by the RANS model has greater magnitude order than the local truncation error of the discretization. You will not get advantage in using high order schemes
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