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Forum: FLUENT April 1, 2013, 05:20
Replies: 17
Views: 3,049
Posted By Far
SST - Steady state - Better mesh

I realized that mesh is not good to resolve flow in wake and quality is poor at hexa-tetra interface which was also indicated by my fellows in this thread. Here is the new mesh and results with SST...
Forum: FLUENT March 26, 2013, 07:06
Replies: 17
Views: 3,049
Posted By Far
wake-seperation interaction

Here is the video clip showing interaction of upstream wakes with separation and subsequent transition of laminar to turbulent flow and reattachment.

http://www.youtube.com/watch?v=CvTbSVgbemk
Forum: FLUENT March 24, 2013, 23:36
Replies: 17
Views: 3,049
Posted By Far
Please have a look on video clip which clearly...

Please have a look on video clip which clearly shows why flow is unsteady:

http://www.youtube.com/watch?v=eQak7dWbXQA

http://www.youtube.com/watch?v=Joc5hvnOfTM
Forum: FLUENT March 24, 2013, 13:11
Replies: 17
Views: 3,049
Posted By Far
SST fully turbulent results

Results with fully turbulent SST model:

http://img203.imageshack.us/img203/7913/t106a6.png

http://imageshack.us/a/img213/7676/t106a8.png

http://imageshack.us/a/img585/9412/t106a10.png
...
Forum: FLUENT March 24, 2013, 13:00
Replies: 17
Views: 3,049
Posted By Far
You mean to say to have mesh independence study...

You mean to say to have mesh independence study based on fully turbulent SST model. How can I justify to use this mesh with transition model?
Forum: FLUENT March 24, 2013, 11:00
Replies: 17
Views: 3,049
Posted By Far
How can I justify my meshes with fully turbulent...

How can I justify my meshes with fully turbulent SST model for the transition flow?

I can recall a paper in which same geometry was solved using K-omega and K-epsilon model and that had not...
Forum: FLUENT March 24, 2013, 10:50
Replies: 17
Views: 3,049
Posted By Far
A Except with restriction on time step size...

A

Except with restriction on time step size in explicit formulation. But explicit option is not available in Fluent for pressure based solvers.




Yes it is. Yes I do know the transition...
Forum: FLUENT March 24, 2013, 01:49
Replies: 17
Views: 3,049
Posted By Far
Ok. I found that segregated solver uses implicit...

Ok. I found that segregated solver uses implicit formulation. But no idea about the new pressure based coupled solver. Logically it should be same. I dont know why they have not provided explicit...
Forum: FLUENT March 24, 2013, 01:12
Replies: 17
Views: 3,049
Posted By Far
It is hybrid mesh. Motivation behind using...

It is hybrid mesh.

Motivation behind using transient simulation is unsteady nature of flow. There are three separation bubble formed at the suction side towards trailing edge and they roll up...
Forum: FLUENT March 23, 2013, 12:03
Replies: 17
Views: 3,049
Posted By Far
update

Solution is being converged within 8-9 iterations for time step size of 5e-05
Forum: FLUENT March 23, 2013, 12:00
Replies: 17
Views: 3,049
Posted By Far
1. Coupled pressure based solver is used. ...

1. Coupled pressure based solver is used.

2. 2nd order implicit time formulation is used

3. 2nd order schemes for all varaibles including turbulence parameters.

4. Mesh size is 70,000...
Forum: FLUENT March 23, 2013, 11:23
Replies: 17
Views: 3,049
Posted By Far
Time step for Low pressure turbine simulation

Hello every one,

I am solving flow on low pressure turbine profile T106A using pressure based coupled solver. I saw a paper (J of Turbomachinery) on the same profile where author had used finitie...
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