# Fluent and backwards facing step

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 December 4, 2006, 15:50 Fluent and backwards facing step #1 Ben Sellars Guest   Posts: n/a Can anyone send me the fluent tutorial for Turbulent flow over a backward facing step in the Fluent website(http://www.fluent.com/software/studentfluent/lcfd.htm)as i dont have have any access to their website. Or does anyone knwown how to specfy a turblent boundary in fluent, with referance to this problem: Problem Description: Backward facing step flows involve separation, free shear layers, recirculation region, and flow reattachment. It has important industrial applications, such as in oil/gas pipes and flow around buildings. This case provides a good test to the capability of CFD software regarding the mathematical models (turbulence models), the numerical algorithms, and the mesh sensitivity. After verification of your solution approach, validation can be carried out by comparing your results with the experimental data available by Driver and Seegmiller, which are provided at the module's webCT website. Figures 1 shows a schematic diagrams of the backward facing step of height H = 1.27cm. The experiment was carried out in a wind tunnel with the step on the floor and the top boundary is the tunnel wall. The tunnel span is 12H. (figure won't copy and paste) inlet height = 8 H outlet height = 9 H depth/ width/ spanwise = 12H where H= Height of the step Figure 1. Inlet Flow Condition: Uin = 44 2 m s-1, Min = 0.128, at atmospheric total pressure and temperature. The turbulent boundary layer thickness at 4H upstream of the step:  = 1.9 cm Note that the boundary layer thickness is significant in comparison with the step height. It is therefore important to match this condition as closely as possible. This can be done by (1) extending the upstream channel length; or (2) specifying a turbulent boundary layer distribution at x = -4H. Only the undeflected upper wall case is considered in this assignment.

 January 8, 2007, 02:02 Re: Fluent and backwards facing step #2 wael Guest   Posts: n/a I hope you got any help. I also need that tutorial. if you have it please send it to me. Many thanks

 February 3, 2007, 13:36 Re: Fluent and backwards facing step #3 arjun Guest   Posts: n/a i need a tutorial on backward facing step and data on reattachment length.. please help

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