CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Flow Through Bend tube of circular c/s

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 8, 2010, 05:52
Default Flow Through Bend tube of circular c/s
  #1
New Member
 
Join Date: Mar 2010
Posts: 14
Rep Power: 7
applemango is on a distinguished road
I am a beginner in Fluent..
1.)I am doing a project in IIT-B,simulating a 90 degree bend circular c/s tube of dia 8mm and length as 10cm..The fluid with which i am working is air/nitrogen..The flow through the channel is incompressible, laminar with Reynolds no 10..i have modelled a 2-D geometry in gambit and given the bcs as mass flow inlet and pressure outlet..So in Fluent while definig the bcs i give the input calculated from the Renoylds no..But im getting very low pressures of the order of 10^-5 Pa across the bend..And the product of friction factor(found out from the static pressure drop across a leng) into the renoylds no gives me the value as low as 0.16..Is there a way in which i can increase the pressure value??

2.)Also for the same geometry i have to simulate for compressible flow, with slip conditions at the boundry and in rarefied gas flow..So what r the changes i shld make...i made the following changes but i am getting very absurd result..I have expreimental data to validate my results which r no where near to that..The changes i madhe are:- i ticked the energy equations, n then ticked on the low pressure option..my bcs are mass flow inlet(which i calculte from te renyolds no) and outflow..I make operation conditions zero.. and then give initial pressure as 100pa..since my expermiental data values for Re 10 are in that range..But insipte of doing this im not getting the results..N one more thing, for slip condition what r the changes to be made?? i just cliked on the specofoed shear option in boundery conditions but since i dont hv shear stress value i leave it as 0..Is it rite a way??
applemango 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
3D FLOW OVER A CIRCULAR CYLINDER Srinivas Mettu FLUENT 2 April 4, 2010 22:11
Question about Oscillating Flow in a Tube Ryan FLUENT 0 December 11, 2005 01:41
Compressible, turbulent flow in a pressure tube Mario FLUENT 2 August 9, 2005 01:47
3D Flow over a circular cylinder Srinivas FLUENT 3 March 15, 2005 20:57
flow in a skinny tube Rookie FLUENT 1 June 10, 2004 18:20


All times are GMT -4. The time now is 02:11.