Turbulent Schmidt numbers for CFD simulations using the k-ε and k-ω models
by Manuel Martínez; Jordi Pallarès; Anton Vernet
Progress in Computational Fluid Dynamics, An International Journal (PCFD), Vol. 16, No. 6, 2016

Abstract: Turbulent diffusion dominates mixing at high molecular Schmidt numbers. When solving the Reynolds averaged Navier-Stokes equations, one of the key parameters for the correct simulation of mixing is the turbulent Schmidt number (Sct). In the case of the k-ε turbulence model, many CFD packages suggest a value of 0.7 for Sct. However, it has been demonstrated that this value is not adequate for all cases. This paper reports simulations for three different cases of turbulent mixing and compares the results with experimental data. It has been found that, for jets in crossflow, Sct is a function of the Reynolds number of the jet, the ratio between the diameters of the jet and main flow and the turbulent intensity of the jet and the main flow. Numerical simulations using the k-ω model are also performed, showing that the required value of Sct is dependent on the turbulence model used.

Online publication date: Mon, 31-Oct-2016

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the Progress in Computational Fluid Dynamics, An International Journal (PCFD):
Login with your Inderscience username and password:

    Username:        Password:         

Forgotten your password?


Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com