CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

VOF simulation troubleshooting required

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

LinkBack Thread Tools Search this Thread Display Modes
Old   October 23, 2023, 03:39
Default VOF simulation troubleshooting required
New Member
Abdullah hassan
Join Date: Oct 2023
Posts: 9
Rep Power: 2
Abdullah hassan is on a distinguished road
I am new to ANSYS and doing an Implicit VOF transient simulation on single tube parrallel heat exchanger.*

Viscous Model:

K-Epsilon with realizable and Enhanced wall function*

VOF Model:*

Primary phase = water liquid (as I don’t need it to put in boundry condition volume fraction)

Secondary phases = water vapor, ammonia liquid, ammonia vapor.


Tube side = Hot fluid =water that converts from vapor to liquid with VOF Lee’s Model at frequency 180/s.

Shell side = Cold fluid = ammonia that converts from liquid to water with Lee’s model frequency 89/s.

Boundry conditions:*

Velocity inlet and pressure outlet.

Tube side = I put water vapor Volume fraction = 1

Shell side = I put ammonia liquid volume fraction = 1


Piso Scheme with all second order upwind


Initially all are at 1 UR factor and then reduced the convergence UR till 0.7.




Water vapor VF = 1 in tube domain

Ammonia liquid VF = 1 in shell domain.


I am facing two big issues.

1- Continity residual is showing a straight line. It is not converging to 1e-3 or 1e-4. it stays at 1e-1 as a straight line. All other residuals are below 1e-6.

2- As water liquid is primary phase so I can’t assign it to any domain. I did the patch to avoid any water liquid in shell domain. After the simulation. What I find out through volume fraction surface and volume intergrals is that “the water liquid is present in both the tube and shell domain”. In tube domain it is condensed from water vapor but from where it comes to shell domain.

Can you guide me on this?
Abdullah hassan is offline   Reply With Quote

Old   December 2, 2023, 10:25
New Member
Abdullah hassan
Join Date: Oct 2023
Posts: 9
Rep Power: 2
Abdullah hassan is on a distinguished road
hello, can anyone guide me on this issue
Abdullah hassan is offline   Reply With Quote


condensation flow, multiphase, vof multiphase

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
VOF simulation crashing - caused by outlet boundary? hxax STAR-CCM+ 4 September 16, 2023 17:43
2D Axisymmetric Swirl VOF Simulation - Phase not changing guilhermemd11 Fluent Multiphase 1 April 21, 2020 04:14
ice melting simulation combine Solidification and VOF model wuxuetianzi FLUENT 3 November 18, 2018 21:03
Using VOF model and Lagrangian Multiphase in the same simulation ganesh_krishnan STAR-CCM+ 2 March 17, 2017 01:34
Thermal Simulation using Multiphase VOF model in Fluent Fluent Multiphase 0 July 20, 2015 11:31

All times are GMT -4. The time now is 08:18.