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-   -   Simple question: Time-Dependent RANS vs URANS (https://www.cfd-online.com/Forums/main/147697-simple-question-time-dependent-rans-vs-urans.html)

c.alanis January 27, 2015 13:58
Simple question: Time-Dependent RANS vs URANS
 
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?

FMDenaro January 27, 2015 16:00
Quote:
Originally Posted by c.alanis (Post 529258)
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)

spl January 28, 2015 10:29
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.

c.alanis January 28, 2015 12:10
Thank you for your replies. :D


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