CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT > Fluent Multiphase

Weird Velocity Field for Capillary Flow in a Horizontal Tube

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 8, 2014, 19:23
Default Weird Velocity Field for Capillary Flow in a Horizontal Tube
  #1
New Member
 
yu feng
Join Date: Jun 2010
Posts: 3
Rep Power: 12
mashimaro_star is on a distinguished road
Dear All,
I am new to use VOF to simulate Transient capillary flow. I tried to setup a simple 2D case for a water capillary flow in a horizontal tube (no gravity). Here are some setups:
(1) The contact angle is 60 degree, and the surface tension coefficient is 0.04 N/m.
(2) The liquid is set as the second phase and the air is the primary phase. I patched a region near the pressure inlet being filled with liquid.
(3) The time step is 1e-5 sec.

The volume fraction result seems ok. But, there are two problems make me feel that there is something not correct for my case:
(1) The interface seems wavy (please see figure 1). Anybody has the same problem? is this normal? Or this is due to some numerical inaccuracy?
(2) The Y-velocity field is weird for me. It seems that my calculation is wrong based on the Y-velocity contour (please see figure 2). If you know how to correct this, please let me know. Thank you very much in advance!!!

Yu



mashimaro_star is offline   Reply With Quote

Old   December 15, 2014, 05:34
Default
  #2
New Member
 
nurfatin
Join Date: Dec 2014
Location: malaysia
Posts: 6
Rep Power: 8
nurfatinas is on a distinguished road
I couldn't load the pictures you had attached somehow but based on your statement I seem to have the same problem as you (or maybe not). Had you possibly resolved the issue? If yes I really hope to hear from you.

The picture is as attached.



Thanks.
nurfatinas is offline   Reply With Quote

Reply

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
How to define a fixed velocity for a given mass flow rate on inlet mqasimali FLUENT 2 April 12, 2013 17:24
Flow Across Tube Banks - Transient vs Steady State HeatTransferFan CFX 11 September 28, 2012 14:21
Velocity of flow v time MitsubishiEvo6 FLUENT 0 August 30, 2012 23:51
Problem with time average tangential velocity in swirl flow. lakhi FLUENT 5 July 18, 2012 16:28
what the result is negatif pressure at inlet chong chee nan FLUENT 0 December 29, 2001 05:13


All times are GMT -4. The time now is 05:43.