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Simple question: Time-Dependent RANS vs URANS

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Old   January 27, 2015, 14:58
Question Simple question: Time-Dependent RANS vs URANS
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Alberto Alanis
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Hello there CFD practicioners,

I have a simple question, however due to the different names given in several scientific papers, i might be a little confused.

1) Is it Time-Dependent RANS the same as URANS (Unsteady RANS)?

2) So, if i am setting a transient/time-dependent study using a commercial code which claims to use the RANS model... Is it actually being solved using the URANS model?
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Old   January 27, 2015, 17:00
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Originally Posted by c.alanis View Post
Hello there CFD practicioners,

I have a simple question, however due to the different names given in several scientific papers, i might be a little confused.

1) Is it Time-Dependent RANS the same as URANS (Unsteady RANS)?

2) So, if i am setting a transient/time-dependent study using a commercial code which claims to use the RANS model... Is it actually being solved using the URANS model?

RANS is - by definition - a statistical formulation only for steady fields. URANS is used when a specifing forcing term at well isolated time-frequency is present (e.g., the motion of a piston in a cylinder)
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Old   January 28, 2015, 11:29
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Hi Claudio

URANS is just the unsteady form of the RANS equation i.e. the variables are a function of space and time. So yes a RANS commercial code with the unsteady/transient setting applied is a URANS formulation.
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Old   January 28, 2015, 13:10
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Alberto Alanis
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Thank you for your replies.
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