CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

Multiphase flow and Phase change due to heat transferevaporation

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes

Reply
 
LinkBack Thread Tools Display Modes
Old   May 29, 2010, 20:34
Default
  #81
Senior Member
 
Sandy Lee
Join Date: Mar 2009
Posts: 213
Rep Power: 10
sandy is on a distinguished road
Hi, why you not to try to combine compressibleInterFoam solver and some heatTransfer solver? I will try it too.
sandy is offline   Reply With Quote

Old   June 9, 2010, 09:54
Default
  #82
Member
 
Join Date: Apr 2010
Posts: 53
Rep Power: 8
bephi is on a distinguished road
hi at all!
at the moment i am doing some simulations of a flow through a piston valve. right now i achieved some good results with the simpleFoam solver including k-w-SST model for low velocities or volume rate respectively. but when the effect of cavitation sets in, my results donīt follow the measured ones. therefore I try to set up a simulation with a multi-phase-solver. I decided to use rasCavitatingFoam but I achieved just unphysical results. After I read that some more people have problems with this solver and a friedly guy showed me a comparison of solvers ( http://web.student.chalmers.se/group...PosterOFW5.pdf ) I thought I rather use interPhaseChangeFoam. Would you say this is a good decision? (1)
Unfortunately I wasnīt able to set up a case now because I always get errors.
I downloaded the dambreak case calculated with interPhaseChangeFoam but I am not exactly sure what I need to change besides BCs and values of nu and rho. Is there somethin else? (2)

at the inlet i define my velocity with fixedValue (0 0 -1.04), outlet has fixedValue with 476.2.
I heard that it would be good to use solutions from a converged calculation as starting values for the more complicated. But how can I do that? (3) After simpleFoam my resulting pressures are given in m^2/s^2 because of the density. interPhaseChangeFoam is compressilble and the pressure unit is Pa.


best wishes!
bephi is offline   Reply With Quote

Old   September 24, 2010, 14:02
Default
  #83
Senior Member
 
Nima Samkhaniani
Join Date: Sep 2009
Location: Tehran, Iran
Posts: 1,193
Blog Entries: 1
Rep Power: 16
nimasam is on a distinguished road
hi buddies
could you please correct me if im wrong

first in phaseChangeTwoPhaseMixture::vDotAlphal() there is following expression
volScalarField alphalCoeff = 1.0/rho1() - alpha1_*(1.0/rho1() - 1.0/rho2());

but the source term in gamma equation is mdot/rhoLiquid , so how the above code can be right ?

second : why the following expression has been added in pEqn.H :
- (vDotvP - vDotcP)*pSat + fvm::Sp(vDotvP - vDotcP, p)
nimasam is offline   Reply With Quote

Old   February 24, 2012, 03:31
Default mDotAlphal() and mDotP() In interphasechange
  #84
Member
 
vahid
Join Date: Feb 2012
Location: Mashhad-Iran
Posts: 80
Rep Power: 5
vahid.najafi is an unknown quantity at this point
Hello OpenFoam users ,

I'mstudying on the Kunz model.we know in this model we have two term for mass dest and prod.(m+ and m-)

What mean mDotAlphal() and mDotP()In interphasechange?
What is the difference between these two??
lekeji likes this.
vahid.najafi is offline   Reply With Quote

Old   April 8, 2013, 07:19
Default
  #85
abe
Member
 
ABE
Join Date: Jul 2012
Posts: 37
Rep Power: 6
abe is on a distinguished road
Hi,
I am using InterPhaseChange solver to simulate cavitation in OF2.1x
Although by old versions (i.e. OF1.5) I can get good results, with this new version results are not good at all. Dose anybody else get similar conflicts?

ABE
abe is offline   Reply With Quote

Old   April 8, 2013, 07:21
Default
  #86
abe
Member
 
ABE
Join Date: Jul 2012
Posts: 37
Rep Power: 6
abe is on a distinguished road
Hi,

I am using InterPhaseChange solver to simulate cavitation in OF2.1x
Although by old versions (i.e. OF1.5) I can get good results, with this new version results are not good at all. Dose anybody else get similar conflicts?

ABE
abe is offline   Reply With Quote

Old   April 9, 2013, 02:49
Default
  #87
abe
Member
 
ABE
Join Date: Jul 2012
Posts: 37
Rep Power: 6
abe is on a distinguished road
Quote:
Originally Posted by Jason3beard View Post
If your simulation is incompressible, then, i think, you must try interPhaseChangeFoam
Hi, thx for your reply. I am using interPhaseChange solver. But I can not get results in OF2.1 or 2.2 versions
abe is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Modelling Supersonic TwoPhase Flow with Phase Change wes OpenFOAM Running, Solving & CFD 8 April 26, 2016 07:21
About phase change heat and mass transfer Michael FLUENT 2 February 13, 2011 02:49
Two phase flow with phase change Ahmad Al-Zoubi CFX 1 November 26, 2008 04:59
Two-phase flow in T-junction, multiphase of DPM? Tony FLUENT 2 July 8, 2008 01:26
how to deal with phase-change heat exchanger? cherry FLUENT 1 April 16, 2002 21:59


All times are GMT -4. The time now is 20:24.