CFD Online Logo CFD Online URL
Home > Forums > FLUENT

About mass flow inlet

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

LinkBack Thread Tools Display Modes
Old   January 16, 2001, 23:56
Default About mass flow inlet
Posts: n/a

A kind of gas(air)is flowing through a tube. Another kind of gas(CH4) is added into the tube through all the side walls of the tube.

I define the inlet of tube as one mass-flow-inlet(air,0.08kg/s).And I define all the side walls as one mass-flow-inlet(CH4,0.027kg/s).And I definethe outlet of the tube as pressure-outlet.

But when the solution is convergenced, I find that the mass faction of CH4 species is very small(about 3*e-22).

How can I solve the problem? Any answner is welcome.

Thank you.

lizihujx 2000.1.17

  Reply With Quote

Old   January 22, 2001, 10:30
Default Re: About mass flow inlet
Angus Duncan
Posts: n/a
Check your velocity vector direction! We've had a similar case here where we had used direction vector as opposed to 'normal to boundary'. like your case, the model ran, reported the correct mass flows, but was wrong.

Hope this helps,

  Reply With Quote


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
velocity calculations in mass flow inlet boundary condition montazer1012 FLUENT 1 October 18, 2010 03:11
particle, parcel and mass flow rate balance flybird FLUENT 0 May 24, 2007 10:44
2 Inlet Pres BC's and Out Mass Flow - Convergence SN Siemens 0 July 19, 2006 09:12
Mass Flow Inlet Pravir Kumar Rai FLUENT 0 February 19, 2003 15:03
mass flow inlet Denis Tschumperle FLUENT 7 August 9, 2000 02:19

All times are GMT -4. The time now is 09:34.