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Influence of mesh size, orientation and type on numerical schemes

Posted July 27, 2014 at 11:13 by Tobi
Updated July 28, 2014 at 04:46 by Tobi

Dear Community,

I am happy and glad to tell you that I finished to analyze all my cases in the investigation of the "Influence of mesh size, orientation and type on numerical schemes in a convective flow field".

Information

  • Investigate into numerical schemes to convective flow field
  • Influence of schemes on mesh size
  • Influence of schemes on mesh type (structured / unstructured)
  • Influence of schemes on mesh/flow orientation (45degree / 0 degree)
...
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Old

Flamelet Model For OpenFOAM

Posted July 15, 2014 at 09:38 by Tobi

Dear all,

I am working in the topic of the steady state laminar flamelet model since 2012 and used this model in my master thesis for biomass combustion chambers. Therefor I used the built version from Alberto Cuoci et. al. which was generated for OpenFOAM-1.7.x. For my research I used a newer version of OpenFOAM due to the fact of released snappyHexMesh version. Bruno Santos rebuilt the flamelet model for OpenFOAM-1.7.x, 2.0.x, 2.1.x - see here: Bruno Santos Blog about libOpenSMOKE...
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Old

How to use dynSmagorinsky model correctly ?

Posted July 9, 2014 at 18:47 by rkc.cfd
Tags sgs, turbulence

This is a good reference for why not to use upwind schemes for LES

Quote:
Originally Posted by alberto View Post
I think it is a tradeoff between stability and accuracy. In a finite volume code, your global accuracy is second order anyway. If you use higher order schemes for the convection term you can have some benefit, but you have also to evaluate how important this benefit compared to the standard linear scheme.

I'll try to give you some information of why central schemes are generally preferred in LES and then
...
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Old

TSAGI HERITAGE, NACA23012, M=0.6, alpha = 3 grad

Posted May 23, 2014 at 03:07 by skeptik (CFD notes)

Code:
#NACA 23012 exp. results alpha = 300' M=0.6
# Cp=(Pfoil - Pinfinity)/q; q = rho*U^2/2
#columns
#    x    Cp
#Upper
1    -0.200
2.5    -0.710    
5    -1.070
7.5    -1.270
10    -1.400
15    -1.345
20    -0.930
25    -0.795
30    -0.700
35    -0.610
40    -0.540
45    -0.475
50    -0.410
55    -0.350
60    -0.280
65    -0.220
70    -0.170
75    -0.130
80
...
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TSAGI HERITAGE, NACA23012, M=0.642, alpha = 1.67 grad

Posted May 20, 2014 at 03:11 by skeptik (CFD notes)

Code:
#NACA 23012 exp. results alpha = 140' M=0.64
# Cp=(Pfoil - Pinfinity)/q; q = rho*U^2/2
#columns
#    x    Cp
#Upper
1    0.400
2.5    -0.380    
5    -0.780
7.5    -1.000
10    -1.160
15    -1.300
20    -0.925
25    -0.750
30    -0.640
35    -0.580
40    -0.520
45    -0.455
50    -0.395
55    -0.340
60    -0.280
65    -0.220
70    -0.165
75    -0.115
80
...
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