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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Print: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v38.i6.30
pages 499-508

Comparison of Standard Turbulent Wall Function with a Non-Equilibrium Wall Model

Hamid Reza Nazif
Imam Khomeini International University
Hassan Basirat Tabrizi
Amirkabir University of Technology Tehran, Iran

ABSTRACT

Non-equilibrium (NE) flows, which could occur in most of industrial problems, have some specific physical appearance. Wall bounded flow with severe adverse pressure, separation, reattachment and stagnation has NE exhibition. A wall function in turbulent flow is a remedy to resolving near wall complex phenomena using predetermined functions as boundary conditions. The advantage of this case is permission to using a relatively coarse near wall cells for saving CPU time. Standard wall function (SWF) is a semi-empirical function which is just valid for local equilibrium flows and constant shear stress at near wall cell. As the k-ε model is a simple but key way in simulation of complex and expensive industrial problems, in present study this turbulent model is employed with a non-equilibrium wall function. The simulation results are validated against ready (DNS) on channel and experimental data on backward facing step (BS). Prediction with this non-equilibrium wall function shows that using this wall approach in k-ε model has not made any sensitive change in equilibrium flow compared with SWF. However, produces effective improvement in NE conditions like flow in a backward facing step.


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