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Search took 0.00 seconds. Search: Posts Made By: flotus1
Forum: FLUENT August 24, 2013, 06:07
Replies: 22
Views: 13,642
Posted By flotus1
I usually disable residual targets for such...

I usually disable residual targets for such simple simulations and run the cases until the residuals level out.
Forum: FLUENT August 23, 2013, 14:03
Replies: 22
Views: 13,642
Posted By flotus1
So... Here are the settings that definitely...

So...
Here are the settings that definitely allow for a converged solution


solver: pressure based, steady, 2d planar, double precision
models: all off except the turbulence models
...
Forum: FLUENT August 21, 2013, 18:10
Replies: 22
Views: 13,642
Posted By flotus1
I hardly believe that you cannot get a converged...

I hardly believe that you cannot get a converged solution with periodic boundary conditions for the flow over a flat plate.
These cases have to converge to floating point accuracy. It may take lots...
Forum: FLUENT August 16, 2013, 05:39
Replies: 22
Views: 13,642
Posted By flotus1
That is what should happen. Dont worry, you are...

That is what should happen. Dont worry, you are on the right path...

With a periodic boundary condition between inlet and outlet, you cannot specify any profiles for velocity or tke in the same...
Forum: FLUENT August 12, 2013, 11:12
Replies: 22
Views: 13,642
Posted By flotus1
A correction to my last post. I put it in a new...

A correction to my last post. I put it in a new post so I hope you see it.

I claimed that the third component of the normal Reynolds stresses \overline{w'w'} was comparatively small... Well that...
Forum: FLUENT August 11, 2013, 15:46
Replies: 22
Views: 13,642
Posted By flotus1
Although your simulation is run on a...

Although your simulation is run on a 2-dimensional domain, the physics are still 3-dimensional. While the time-averaged velocity in w-direction is zero (thats why a 2-dimensional simulation with a...
Forum: FLUENT August 11, 2013, 04:01
Replies: 22
Views: 13,642
Posted By flotus1
Let me start from the beginning. The turbulent...

Let me start from the beginning.
The turbulent kinetic energy k is the trace of the Reynolds stress tensor

k=\frac{1}{2} \left[ \overline{u'u'}+\overline{v'v'}+\overline{w'w'} \right] .

So if...
Forum: FLUENT August 10, 2013, 16:50
Replies: 22
Views: 13,642
Posted By flotus1
This seems to be too much, which would also...

This seems to be too much, which would also explain why the tke in your simulations decays too fast.
Since the flow is considered fully developed, you could run a simulation with a periodic channel...
Forum: FLUENT August 10, 2013, 15:19
Replies: 22
Views: 13,642
Posted By flotus1
What is your boundary condition for the...

What is your boundary condition for the dissipation of the tke at the inlet?
This could cause the discrepancy between the simulation and the experiment.
Forum: FLUENT August 10, 2013, 12:02
Replies: 22
Views: 13,642
Posted By flotus1
A quick estimate of the Reynolds number yields...

A quick estimate of the Reynolds number yields ~1600 (assuming the kinematic viscosity of air).
Are you sure that this is correct?

If so, the standard k-epsilon model is not the best choice...
Forum: FLUENT August 10, 2013, 06:33
Replies: 22
Views: 13,642
Posted By flotus1
Which turbulence model did you use in your...

Which turbulence model did you use in your simulation?
Which kind of wall function?
How about Yplus values?
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