
[Sponsors] 
How to transform (mass flow rate) boundary condition from 3D to 2D? 

LinkBack  Thread Tools  Display Modes 
October 18, 2012, 03:26 
How to transform (mass flow rate) boundary condition from 3D to 2D?

#1 
New Member
Nurul
Join Date: Sep 2012
Posts: 15
Rep Power: 4 
Hello everybody,
I'm using CFDFluent to simulate gasification. In my case, mass flow rate that enter gasifier column is 0,0074 kg/s of coal. I want to simulate with 2D geometry. Only half of the domain with is modeled because of symmetry. Is it same the number of mass flow rate in 3D and 2D? Is the mass flow rate used in 2D unchanged (0,0074 kg/s)? Or the mass flow rate must be devided to transform in 2D? I hope you can help me. Thanks. Last edited by nurul efha; October 18, 2012 at 04:09. 

October 20, 2012, 13:29 

#2 
Member
Join Date: Mar 2011
Posts: 64
Rep Power: 6 
Hi.
Are you using 2D Axsymmetric? If yes, mass flow should be divided by (2*PI). You are just modeling 1 rad of the whole circle.
__________________
Saeed Sadeghi Ansys Fluent CFD Consultant 

October 21, 2012, 17:59 

#3  
Member
misagh
Join Date: Apr 2012
Posts: 47
Rep Power: 5 
Quote:
You had better use intensive property for your simulation and further calculation.it is an easy way to get rid of changing units in 2.d or 3.d . i mean instead of using mass flow rate(which is an extensive property) just use velocity(intensive property) good luck 

October 21, 2012, 20:47 

#4 
New Member
Nurul
Join Date: Sep 2012
Posts: 15
Rep Power: 4 

October 21, 2012, 20:49 

#5  
New Member
Nurul
Join Date: Sep 2012
Posts: 15
Rep Power: 4 
Quote:
I think so. Thanks... 

October 27, 2012, 14:03 

#6  
New Member
Nick
Join Date: Mar 2009
Location: England (South West)
Posts: 25
Rep Power: 8 
Quote:
Can you expand on this ? I have always entered the full mass flow for axisymetric problems, not a 1 rad slice... Quick search to find a Fluent manual online, reveals the following, (v6.3) http://hpce.iitm.ac.in/website/Manua...ug/node227.htm Quote:


Thread Tools  
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Wind turbine simulation  Saturn  CFX  34  October 16, 2014 05:27 
CFX13 Post Periodic interface  EtaEta  CFX  7  December 8, 2011 18:15 
mass flow in is not equal to mass flow out  saii  CFX  2  September 18, 2009 08:07 
Mass flow boundary condition  Síle  FLUENT  0  June 12, 2003 07:30 
Constant mass flow rate / choking outlet bounardy condition  Min Zhu  Main CFD Forum  1  September 29, 1998 15:33 