[farzadmech]

Hello all
I am using motorbike example to simulate my airfoil like geometry. After simulation velocity field and pressure fields are ok, but TKE(k) field shows weird behavior. it must show higher k in the downstream, but it shows zero k(TKE) in the downstream and in other places it shows higher k(TKE) where in those location k(TKE) must be zero.
Also, I have attached larger image for k(TKE) and Oemga filed and it seems that Omega has a singularity point, but mesh and simulation works fine.

I will be thankful for any suggestion.



Thanks,
Farzad

[farzadmech]

The only real difference between my simulation and motorbike is that I have modified fvSchemes a little bit using lomitedlinear 1, where 1 is the coefficient. I have attached the divSchemes to this post.


Thanks
Farzad

[farzadmech]

ok, I find what was my problem, recalculate k and omega based 2% turbulence intensity and 10% of the Lref(length of my shape) as my turbulent length scale;

Turbulent intensity = 2%*UfreeStream
Turbulent length scale = 10%*GeometryLength

And now my results are good. I have attached my new results to this post.


Thanks,
Farzad

Originally Posted by farzadmech

Hello all
I am using motorbike example to simulate my airfoil like geometry. After simulation velocity field and pressure fields are ok, but TKE(k) field shows weird behavior. it must show higher k in the downstream, but it shows zero k(TKE) in the downstream and in other places it shows higher k(TKE) where in those location k(TKE) must be zero.
Also, I have attached larger image for k(TKE) and Oemga filed and it seems that Omega has a singularity point, but mesh and simulation works fine.

I will be thankful for any suggestion.



Thanks,
Farzad