2D Axisymmetrical Flow of an Impingement Jet onto a Normal Surface

PWilson · April 2, 2015, 07:15

I'm currently performing a numerical study of an 2D Axisymmetrical Flow of an Impingement Jet onto a Normal Surface as part of my degree final year project.

I've encountered some difficulty in correctly modelling the heat transfer and flow properties around r/D <= 1, i.e. in the stagnation region. My stagnation region is much larger than expected and the velocity recovery around r/D = 0 is much slower than expected.

I'm using the SST Turbulence Model, with Re = 23,000 & H/D = 2 to try and validate a simulation against Cooper et al. Experimental data (http://cfd.mace.manchester.ac.uk/cgi...&&*%%%%dm=Line - C.25).

After some initial issues, I have opted to use the directed meshing option to better refine the areas of interest.

Inlet Boundary conditions are as follows:
Velocity = 3.57m/s (rearrangement of Re = Ul/v)
lengthscale = 0.07Dh = 0.07*0.1016 = 7.112e-3m
Intensity = 0.16Re^-(1/8) = 0.16*23000^(-1/8) ~= 0.045 (4.5%)

If anyone would like to see the graphs I have plotted please let me know and I can send over the data I have currently. Any help would be greatly appreciated.

Thanks.

kerim · December 15, 2021, 03:14

Dear PWilson,
I know that is an old post, but I am very interested in the detailed information about your simulation.
Could you share your results?
Any kind of your help is highly appreciated.
Kerim

April 2, 2015, 07:15	2D Axisymmetrical Flow of an Impingement Jet onto a Normal Surface	#1
PWilson New Member Join Date: Feb 2015 Posts: 1 Rep Power: 0	I'm currently performing a numerical study of an 2D Axisymmetrical Flow of an Impingement Jet onto a Normal Surface as part of my degree final year project. I've encountered some difficulty in correctly modelling the heat transfer and flow properties around r/D <= 1, i.e. in the stagnation region. My stagnation region is much larger than expected and the velocity recovery around r/D = 0 is much slower than expected. I'm using the SST Turbulence Model, with Re = 23,000 & H/D = 2 to try and validate a simulation against Cooper et al. Experimental data (http://cfd.mace.manchester.ac.uk/cgi...&&%%%%dm=Line - C.25). After some initial issues, I have opted to use the directed meshing option to better refine the areas of interest. Inlet Boundary conditions are as follows: Velocity = 3.57m/s (rearrangement of Re = Ul/v) lengthscale = 0.07Dh = 0.070.1016 = 7.112e-3m Intensity = 0.16Re^-(1/8) = 0.16*23000^(-1/8) ~= 0.045 (4.5%) If anyone would like to see the graphs I have plotted please let me know and I can send over the data I have currently. Any help would be greatly appreciated. Thanks.

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December 15, 2021, 03:14		#2
kerim Senior Member abdikerim kurbanaliev Join Date: Jun 2010 Location: Kyrgyzstan, Osh Posts: 120 Rep Power: 15	Dear PWilson, I know that is an old post, but I am very interested in the detailed information about your simulation. Could you share your results? Any kind of your help is highly appreciated. Kerim