3D Diffuser

Authors: Cherrye et al.

Type: Experimental

Status:

Contents

Description

Flow Parameters

Reference Publications

Results

Description

Three dimensional diffuser with two diverging wall at different angles. There are two different geometries based on inlet height.: Diffuser 1 has an aspect ratio of 1:3.33 at inlet and a square outlet of 4h Diffuser 2 has the same inlet but the outlet is 3.37hx4.51h.

The inlet is fully turbulent flow.

Flow Parameters

Reynolds number based on the inlet height and bulk velocity of 10000.

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Additional information (links, pictures, etc.)

Part of the 15 ERCOFTAC workshop at:

• Diffuser geometry:
  

• Experimental results visualization The experimental results comes as a matlab file. Here is how to visualize it with EnSight.
  • download the experiments data file : you'll need the file Diffuser_1_data.mat
  • run the python script post.py : it reads the matlab data file, and writes X, Y, Z coordinate lists as well as velocity files: python post.py
  • run the fortran mesh_generator.F : it reads the coordinates lists and generates the mesh stem.unv
  • run a simple Saturne case. You'll need:
    • the files U_exp.dat , V_exp.dat and W_exp.dat in the DATA directory
    • the following fortrans : usclim.F, usdpst.F, usini1.F, usiniv.F, usmpst.F, usvpst.F
    • the mesh stem.unv in the MAILLAGE folder. With this, you run a 1 time step case, frozen field (ICCVFG=1), fake LES (ITURB=40), initialized by the velocity field given by the experiment on the grid given by the experiment. This method, unlike generating your own ensight output, knowing its format, enables you to focus only in a relevant part of the experimental grid (this is done by the *pst.F fortrans). It only displays the part of the grid which actually contains data.

Experiments

Phi-f

EBM

Reference Publications

Cherrye, E. Elkins, C and Eaton, J. "Geometric sensitivity of three dimensional separated flows". Int. Journal of Heat and Fluid Flow. 2008 (29) pp. 803-811

Results

Simulation results available for this case:

Code	Version	Author	Restrictions
Code Saturne	1.4.0 and 1.3.2	Juan Uribe, Flavien Billard	Main.None

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