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Showing results 1 to 18 of 18 Search took 0.00 seconds. Search: Posts Made By: giammy92

Forum: OpenFOAM Running, Solving & CFD April 11, 2016, 07:53

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 Do you think that for omega's bc at wall i have... Do you think that for omega's bc at wall i have to use Menter's recommended wall BC, i. e. omegawall=60*nu/(beta*y^2), with nu=kinematic viscosity at the wall, beta=0.075 and y=normal distance ...

Forum: OpenFOAM Running, Solving & CFD April 8, 2016, 12:04

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 and my now i'm trying with this fvschemes and... and my now i'm trying with this fvschemes and fvsolution: ddtSchemes { default steadyState; } gradSchemes { default Gauss linear;

Forum: OpenFOAM Running, Solving & CFD April 8, 2016, 12:02

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 My current dat are: K dimensions ... My current dat are: K dimensions [0 2 -2 0 0 0 0]; internalField uniform 0.0025847; boundaryField {

Forum: OpenFOAM Running, Solving & CFD April 8, 2016, 11:29

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 but my previous are unbelieveble! I have changed... but my previous are unbelieveble! I have changed my mixing leght, and increasing it until 100, i have achieved the same results for Cl!! What means this?

Forum: OpenFOAM Running, Solving & CFD April 8, 2016, 11:24

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 now i'm trying with this: ddtSchemes { ... now i'm trying with this: ddtSchemes { default steadyState; } gradSchemes {

Forum: OpenFOAM Running, Solving & CFD April 7, 2016, 11:42

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 My results of Cl, for every BC's that i have... My results of Cl, for every BC's that i have tried, still remain about 1.5, but Cl must be about 1.25. How is possible that? I have a mesh very fine with y+ less than 1. I've found a discussion...

Forum: OpenFOAM Running, Solving & CFD April 2, 2016, 09:33

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 I want use k omega SST for high value of reynold... I want use k omega SST for high value of reynold even if my y+ around airfoil is <1 because i want a flux turbulent fully developed. So which BC for wall should use? now i'm using: k ...

Forum: OpenFOAM Running, Solving & CFD April 2, 2016, 09:16

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 these are my fvschemes and mu fv solution: ... these are my fvschemes and mu fv solution: ddtSchemes { default steadyState; } gradSchemes { default Gauss linear;

Forum: OpenFOAM Running, Solving & CFD March 29, 2016, 19:06

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 another confirm that i have to ask: in file... another confirm that i have to ask: in file forces_coeff is right to consider both lref and Aref 0.5459, value of chord lenght?

Forum: OpenFOAM Running, Solving & CFD March 29, 2016, 18:49

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 I have this doubt: for M=0.12, Re=1.5e6 e... I have this doubt: for M=0.12, Re=1.5e6 e p=101325 Pa I have calculated a rho=1.1854 and mu=1.7908e-5 considering p=rho*R*T with T=298K. But, i don't understand because in the precedent study with...

Forum: OpenFOAM Running, Solving & CFD March 29, 2016, 18:17

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 here the last time directory of yplus: Time... here the last time directory of yplus: Time = 6500 Reading field U Reading/calculating face flux field phi Selecting incompressible transport model Newtonian Selecting turbulence model...

Forum: OpenFOAM Running, Solving & CFD March 29, 2016, 17:53

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 after running yPlus i have this for time 0: ... after running yPlus i have this for time 0: Create mesh for time = 0 Time = 0 Reading field U Reading/calculating face flux field phi Selecting incompressible transport model Newtonian

Forum: OpenFOAM Running, Solving & CFD March 29, 2016, 17:42

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 Good i have ran yPlus and it has created field... Good i have ran yPlus and it has created field yPlus for every time directory. Now which value of yPlus i have to read? That in directory 0, min, max or average?

Forum: OpenFOAM Running, Solving & CFD March 29, 2016, 17:06

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 this is a good question :D i don't know this... this is a good question :D i don't know this because i'm using a mesh created by another student that rans this case with fluent. Can i occur y+ for example with a checkmesh?

Forum: OpenFOAM Running, Solving & CFD March 29, 2016, 16:50

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 my problem is I can't obtain Cl of about 1.2-1.3,... my problem is I can't obtain Cl of about 1.2-1.3, that is the right value comparing with experimental results, instead i obtain Cl of about 1.5. What could be cause of this?

Forum: OpenFOAM Running, Solving & CFD March 29, 2016, 11:53

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 I would especially confirmations for nut and for... I would especially confirmations for nut and for mixing lenght

Forum: OpenFOAM Running, Solving & CFD March 28, 2016, 19:42

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 airfoil 2D: how to validate results? Hi foamers, my case consists in airfoil 2D with a chord lenght 0.5459 m in a flow of air with a U=41.511 m/s, M=0.12, Re=1.5e6, turbulent intensity(%)=0.1, turbulent viscosity ratio=0.1 and angle of...

Forum: OpenFOAM Running, Solving & CFD March 28, 2016, 19:20

Replies: 23 airfoil 2D: how to validate results? Views: 2,106 Posted By giammy92 airfoil 2D: how to validate results? Hi foamers, my case case sists in a airfoil 2D with a chord lenght of 0.5459 m. I have found this formula in this site for mixing lenght http://www.cfd-online.com/Wiki/Turbulence_length_scale Do...

Showing results 1 to 18 of 18

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