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Search took 0.00 seconds. Search: Posts Made By: HectorRedal
Forum: Main CFD Forum April 30, 2016, 11:28
Replies: 16
Views: 1,015
Posted By HectorRedal
Hi Filippo, I have checked the BC for the...

Hi Filippo,

I have checked the BC for the pressure and the velocity at the exit of the domain, and they appear to have been defined correctly.

I have also checked the gradient of the velocity...
Forum: Main CFD Forum April 29, 2016, 17:29
Replies: 16
Views: 1,015
Posted By HectorRedal
For solving the poisson equation I am using a...

For solving the poisson equation I am using a bi-conjugated gradient stabilizated solver.
I do not use any kind of Rhie and Chow dissipation.
Where can I find information about the Rhie and Chow...
Forum: Main CFD Forum April 29, 2016, 10:50
Replies: 16
Views: 1,015
Posted By HectorRedal
I can try to use 0.3 as indicated, which I...

I can try to use 0.3 as indicated, which I undestand is an semi-implicit strategy for the pressure. I will give it a try. I will inform you with the outcome.

By the way (only so as to frame the...
Forum: Main CFD Forum April 29, 2016, 10:45
Replies: 16
Views: 1,015
Posted By HectorRedal
Thanks for the explanation. Then I think that I...

Thanks for the explanation.
Then I think that I am facing up an instability, since the solution blows up.
I have double check the boundary condition (at the outflow), and it appears to be well...
Forum: Main CFD Forum April 29, 2016, 10:02
Replies: 16
Views: 1,015
Posted By HectorRedal
Which is the difference between wiggle and...

Which is the difference between wiggle and instability?

Maybe I have misunderstood you in my reply.
When the instability appears, there is not any steady state solution that can be reached.
Forum: Main CFD Forum April 29, 2016, 10:01
Replies: 16
Views: 1,015
Posted By HectorRedal
Hi Arjun, After the instability appears, the...

Hi Arjun,

After the instability appears, the flow reverses and start growing and growing until it becomes very large.

The flow is supposed to be incompressible.

There are two parameters that...
Forum: Main CFD Forum April 29, 2016, 06:14
Replies: 16
Views: 1,015
Posted By HectorRedal
Hi Filippo, The instability appears after...

Hi Filippo,

The instability appears after the flow has been stablished and had reached the end of the domain (right).
The boundary conditions I have using at the end of the domain are: du/dx =...
Forum: Main CFD Forum April 28, 2016, 17:28
Replies: 16
Views: 1,015
Posted By HectorRedal
How to fix / solve local instability

Hi,

I would like to know how a local instability can be fixed. Is there any strategy when choosing the parameters for the solver?

I am attaching an image of a local instability I am...
Showing results 1 to 8 of 8

 
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