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Search: Posts Made By: praveen
Forum: Main CFD Forum August 19, 2015, 01:32
Replies: 3
Views: 238
Posted By praveen
There are explicit space-time DG schemes...

There are explicit space-time DG schemes available, where you can do time accurate local time stepping, see papers of Gassner, Munz, Dumbser, etc. You can go to very high orders of accuracy.
Forum: Main CFD Forum August 19, 2015, 01:02
Replies: 3
Views: 238
Posted By praveen
I have also wondered why there is not much...

I have also wondered why there is not much discussion of this. Whenever I read papers on high order methods, people only discuss DG, spectral volume, spectral difference, flux reconstruction, weno,...
Forum: Main CFD Forum July 30, 2015, 12:09
Replies: 8
Views: 327
Posted By praveen
To quote Slemrod I think he is saying...

To quote Slemrod



I think he is saying that at very small scales, capillarity dominates viscosity.

This is all new stuff to me, so I dont know what people have done in terms of solving the...
Forum: Main CFD Forum July 30, 2015, 10:11
Replies: 2
Views: 1,151
Posted By praveen
I could not get carbuncle on purely unstructured...

I could not get carbuncle on purely unstructured grids. If you use structured grids which are triangulated, you may get carbuncle. As you said, the shock has to be aligned with the grid lines to see...
Forum: Main CFD Forum July 30, 2015, 10:08
Replies: 8
Views: 327
Posted By praveen
Slemrod refers to papers by Gorban & Karlin and...

Slemrod refers to papers by Gorban & Karlin and Saint-Raymond where they derive the Korteweg model starting from Boltzmann equation. This model is similar to Navier-Stokes but has additional Korteweg...
Forum: Main CFD Forum July 30, 2015, 09:43
Replies: 8
Views: 327
Posted By praveen
Famous Fluid Equations Are Incomplete

Here is an intro to a paper by Marshall Slemrod
...
Forum: Main CFD Forum April 14, 2015, 15:07
Replies: 6
Views: 786
Posted By praveen
"HPC is dying, and MPI is killing it"

That is the title of an article by Jonathan Dursi

http://www.dursi.ca/hpc-is-dying-and-mpi-is-killing-it/

Since MPI is widely used in CFD, I want to know what CFD people think about this.
...
Forum: Tecplot February 11, 2015, 00:50
Replies: 4
Views: 730
Posted By praveen
Hello Straton I did not receive any email....

Hello Straton

I did not receive any email. The license is linked to our system admin (shree @ math.tifrbng.res.in) but he has not received any email either.

Here is what I found. I obtained the...
Forum: Tecplot February 10, 2015, 09:12
Replies: 4
Views: 730
Posted By praveen
What should I do now ? Should I file a support...

What should I do now ? Should I file a support request ?
Forum: Tecplot February 2, 2015, 09:43
Replies: 4
Views: 730
Posted By praveen
Changing hostname problem on OSX Yosemite

On my macbook pro running OSX yosemite, I had installed tecplot at my univ and it was working. This is single user license.

At home, it complains about invalid license and it seems to have problem...
Forum: Tecplot February 1, 2015, 00:04
Replies: 2
Views: 798
Posted By praveen
This does the job, thanks. I just set a sym link...

This does the job, thanks. I just set a sym link called "tec360" to the executable.
Forum: Tecplot January 31, 2015, 05:20
Replies: 2
Views: 798
Posted By praveen
Command line program tec360 missing in Tecplot 360 EX

Hello

In older tecplot versions, I could launch tecplot from command line using "tec360". But this seems to be missing in the latest versions.

I am on Mac OSX. How to launch from command line ?...
Forum: Main CFD Forum July 24, 2014, 03:27
Replies: 6
Views: 369
Posted By praveen
You may not get the momentum to be constant but...

You may not get the momentum to be constant but the fluxes should be nearly constant. Can you check if the spike decreases with grid refinement. If it does then you dont need to worry about it.
Forum: Main CFD Forum July 23, 2014, 23:51
Replies: 6
Views: 369
Posted By praveen
Since you use a finite volume method total...

Since you use a finite volume method total momentum is conserved. Why do you say it is not conserved ?

In some cases, you can get exact solution with riemann solvers. Maybe you are in that...
Forum: Main CFD Forum July 23, 2014, 06:46
Replies: 6
Views: 369
Posted By praveen
We can write the Roe flux as F_{j+1/2} =...

We can write the Roe flux as


F_{j+1/2} = \frac{1}{2}[F(u_{j+1/2}^L) + F(u_{j+1/2}^R)] - \frac{1}{2}D(u_{j+1/2}^L, u_{j+1/2}^R) (u_{j+1/2}^R - u_{j+1/2}^L)


where the matrix D involves the...
Forum: Main CFD Forum May 19, 2014, 05:01
Replies: 9
Views: 919
Posted By praveen
It may happen that openfoam has some sort of...

It may happen that openfoam has some sort of asymmetry in the solution process which induces instabilities to develop. If it does not happen in comsol you have to add some disturbance yourself.
Forum: Main CFD Forum May 18, 2014, 13:49
Replies: 9
Views: 919
Posted By praveen
You may have to add some disturbance to induce...

You may have to add some disturbance to induce unsteadiness. E.g., perturb the initial condition by a small amount.
Forum: Main CFD Forum March 17, 2014, 07:56
Replies: 3
Views: 416
Posted By praveen
There are several options for compressible codes ...

There are several options for compressible codes

Here are some simple codes which also have airfoil examples in them

NSC2KE (unstructured)
Blazek's CFD book comes with open source code...
Forum: Main CFD Forum March 16, 2014, 01:05
Replies: 6
Views: 1,876
Posted By praveen
I have c and fortran code for quasi-1d nozzle ...

I have c and fortran code for quasi-1d nozzle

https://code.google.com/p/cfdlab/source/browse/trunk/1d/nozzle/src-c
https://code.google.com/p/cfdlab/source/browse/trunk/1d/nozzle/src-f
Forum: Main CFD Forum January 12, 2014, 01:04
Replies: 3
Views: 1,861
Posted By praveen
The paper claims to prove existence of solution...

The paper claims to prove existence of solution under periodic boundary conditions. It does not mean that you have an analytical formula for the general solution. Still, if this turns out to be true,...
Forum: Main CFD Forum December 23, 2013, 10:32
Replies: 22
Views: 1,218
Posted By praveen
Going back to the original question about...

Going back to the original question about evaluating solution at some arbitrary point in the domain.

Galerkin, petrov-galerkin and DGFEM all give us a function as a solution, so in this case it is...
Forum: Main CFD Forum December 23, 2013, 06:16
Replies: 22
Views: 1,218
Posted By praveen
Suppose you have a weak formulation ...

Suppose you have a weak formulation


\mbox{Find } u \in V \mbox{ such that } a(u,v) = l(v) \mbox{ for all } v \in V


In the FEM, we approximation the function space V by a finite dimensional...
Forum: Main CFD Forum December 22, 2013, 04:17
Replies: 22
Views: 1,218
Posted By praveen
The FEM solution is a "function" which you can...

The FEM solution is a "function" which you can evaluate anywhere you like. You can also compute cell average from the FE solution.

FVM gives you only cell average value. To approximate the...
Forum: Main CFD Forum December 15, 2013, 01:15
Replies: 32
Views: 1,352
Posted By praveen
How do you compute divergence in physical space ?...

How do you compute divergence in physical space ? using finite differences will not be accurate. You have to take divergence of the spectral interpolation of the velocity field, which should then...
Forum: Main CFD Forum November 8, 2013, 07:39
Replies: 0
Views: 615
Posted By praveen
"Exact" solution of shu-osher test case

The Shu-Osher test case is one of the standard problems for compressible flows, see

http://flash.uchicago.edu/~jbgallag/2012/flash4_ug/node34.html#SECTION08117000000000000000

Most papers show...
Showing results 1 to 25 of 249

 
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