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Search: Posts Made By: CFDtoy
Forum: ANSYS March 7, 2014, 01:34
Replies: 1
Views: 1,127
Posted By CFDtoy
modeling

If you have data to compare, I can help you model natural gas corrosion
Forum: ANSYS March 13, 2013, 00:32
Replies: 1
Views: 649
Posted By CFDtoy
reference data

Where do you find reference data for such work -
Forum: OpenFOAM September 6, 2012, 10:50
Replies: 6
Views: 734
Posted By CFDtoy
Impes

Hi Cyp,

Thank you very much for your comment. Please send it to cfdtoy@gmail.com

Kr,
CFDtoy
Forum: OpenFOAM September 5, 2012, 17:55
Replies: 6
Views: 734
Posted By CFDtoy
Buckley-Leverett Problem

Hello,

Has openFoam been used to solve Buckley-Leverett problem? Can anyone point me to references - what solver procedure and assumptions used?

--
CFDtoy
Forum: Main CFD Forum February 15, 2012, 12:31
Replies: 0
Views: 382
Posted By CFDtoy
Looking for a Cavitation Exp Paper

Hi all,

I am looking for

Abuaf, N., et al., A Study of Nonequilibrium Flashing of Water in a Converging-Diverging Nozzle, NUREG/CR 1864, Vol. 2, Office of Nuclear Regulatory Research, 1981
...
Forum: CFX January 19, 2012, 15:09
Replies: 4
Views: 1,088
Posted By CFDtoy
Cavitation with Energy

Hi Akash,

I hope you have already figured out the way to carry out your runs. If not:

- run your incompressible cavitation run along with energy equation. You can use mixture energy modeling....
Forum: Main CFD Forum October 4, 2011, 09:32
Replies: 2
Views: 855
Posted By CFDtoy
Copy

Nope I dint. I rather used some papers (of Kurul and others) and made a model for RPI boiling myself :D
Forum: Main CFD Forum September 29, 2011, 12:43
Replies: 2
Views: 599
Posted By CFDtoy
fluid flow

This is a classical cavitation problem :) use multiphase module - simulate steady state cavitation case and show volume fraction of vapor phase ! you are done.

/CFDtoy
Forum: FLUENT September 29, 2011, 11:56
Replies: 9
Views: 4,209
Posted By CFDtoy
convergence issue

Hi,

I dont have the recent ANSYS 13 manual - so dont know what input is being specified from your end. Is it possible for you to upload / send ANSYS manual for this feature alone?

I think the...
Forum: Main CFD Forum September 27, 2011, 11:17
Replies: 2
Views: 882
Posted By CFDtoy
Microscale HT

At the micro level, capillary effects are much higher compared to convection scales. Use of VOF approach is preferred to get the bubble dynamics (injected into the channels) such as coagulation,...
Forum: Main CFD Forum September 27, 2011, 11:13
Replies: 1
Views: 523
Posted By CFDtoy
divergence - AMG

The pressure correction solver doesnt like the constructed matrix - check your solver controls.

1. Reduce relaxation for momentum and pressure and run it.
2. Check your phase change conditions...
Forum: FLUENT September 22, 2011, 11:26
Replies: 9
Views: 4,209
Posted By CFDtoy
condensation

Hi,

use either a two-fluid or even a mixture model - doesnt matter. You need to write appropriate mass transfer function. Not only volumetric condensation - you probably have to model wall...
Forum: Main CFD Forum July 11, 2011, 11:46
Replies: 0
Views: 452
Posted By CFDtoy
Eulerian multifluid model with LES

Hi all,

Do commercial codes when operating LES with Eulerian multi-fluid model solve for k eqn or sub-grid scale viscosity for each phase or solves a mixture k eqn?

For VOF type flows with LES,...
Forum: Main CFD Forum July 7, 2011, 10:00
Replies: 2
Views: 632
Posted By CFDtoy
vibrating films

take a look at this thread:

http://www.cfd-online.com/Forums/main/71391-acoustic-cavitation-modeling-comsol.html

ANSYS Fluent can do this pretty straight forward. I have placed a thesis...
Forum: Main CFD Forum June 15, 2011, 12:45
Replies: 2
Views: 1,586
Posted By CFDtoy
solving Comp flows

hello,
try this p or rho based solver test on simple shock tube problem - wont take much time and after that you can be sure what to use. for example, you want to capture accelerating fronts well...
Forum: OpenFOAM June 10, 2011, 09:51
Replies: 3
Views: 2,446
Posted By CFDtoy
MP Piso loop

Thanks for your quick response. Basically for MP the solution procedure typically requires

solve vf
solve U
Solve P'
Correct U, P

This is simple schema.

For MP PISO,
Forum: OpenFOAM June 9, 2011, 16:04
Replies: 3
Views: 2,446
Posted By CFDtoy
Multiphase PISO loop in OpenFoam

Hello Foamers,
I have a question on the PISO implementation in OF - particularly for multiphase applications.

For PISO solutions, for example, the loop taken from twoPhaseEulerFoam...
Forum: Main CFD Forum June 3, 2011, 13:08
Replies: 2
Views: 707
Posted By CFDtoy
pressure sink

If I were you, I will look closely at my pressure correction eqn and see how the af terms (mass flux term) is modeled. Be careful implementing your rhie-chow interpolation and since you have body...
Forum: Main CFD Forum June 3, 2011, 10:08
Replies: 7
Views: 1,373
Posted By CFDtoy
bubbly flow

Hello,
looking at turb KE initially may not be worth it..initial discrepancies may be due to initialization (how you have initialized k,e everywhere when starting runs), or other numerical...
Forum: Main CFD Forum June 2, 2011, 10:25
Replies: 6
Views: 609
Posted By CFDtoy
mild compressibility

For mildly compressible..you can get away with not solving for E. T can remain constant in the system, with rho changing with P only.
Forum: Main CFD Forum June 1, 2011, 10:09
Replies: 6
Views: 609
Posted By CFDtoy
mild compressibility

Hello,
For mild compressibility - your pressure correction will have an additional term as d(rho')/dt modeled as, d(p'/C2)/dt where C = speed of sound. This will go into your ap (solving for p')....
Forum: Main CFD Forum May 31, 2011, 10:24
Replies: 7
Views: 1,373
Posted By CFDtoy
bubbly flow

Hello,
For your case, no need for VOF. You can use eulerian model and derive the distribution of phases pretty well. (Unless you want to track each and every bubble - I dont think that is the...
Forum: Main CFD Forum May 24, 2011, 13:34
Replies: 2
Views: 843
Posted By CFDtoy
Boundary conditions

if incompressible, use static pressure-inlet and pressure outlet (keep outlet pressure to 1 bar atmospheric - or if you know the exact value).

For compressible case, use mass flow at inlet and...
Forum: Main CFD Forum May 22, 2011, 12:50
Replies: 7
Views: 2,450
Posted By CFDtoy
Schemes

Hello,
phi_ip = phi_up - based on flux direction is upwind. Anything added to it, makes high resolution. Central diff simply takes 0.5 as blending factor.

Different schemes like bounded TVD...
Forum: Main CFD Forum May 20, 2011, 09:49
Replies: 5
Views: 2,832
Posted By CFDtoy
VF computation

Hi,
if you are doing multiphase flows (boiling flows), vf is an output. If it is your own code, you will need to output volume fraction. Does this answer your question?

if you are asking how to...
Showing results 1 to 25 of 144

 
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