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

Numeca Fine/Hexa simulation of catalytic converter

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 10, 2010, 07:43
Default Numeca Fine/Hexa simulation of catalytic converter
  #1
Member
 
giacomo combariati
Join Date: Aug 2009
Posts: 36
Rep Power: 7
jackr84 is on a distinguished road
Hi, I don't find user guide or tutorial of Numeca Fine/Hexa, for this reason I'm tring to know parameter's definition in the Boundary Condition and Initial solution, exactly:
What do it means "reference parameters" in the section "Flow model Parameters"?
How do i do to initialize the solution with costant values? My boundary condition are:
mass flow rate=0,125 kg/s, pressure outlet 90211 Pa, ambient pressure 98350 Pa, and i have a porous media where the inertial and viscous resistance I determinated with Ergun equation.
jackr84 is offline   Reply With Quote

Old   April 11, 2010, 23:17
Default
  #2
Senior Member
 
Hamid Zoka
Join Date: Nov 2009
Posts: 162
Rep Power: 8
Hamidzoka is on a distinguished road
Dear jack;
"reference parameters" are applied to calculate some variables like entropy. for example when calculating delta entropy you need reference pressure and temperature. "reference parameters" are usually set to ambient conditions and the solution is not sensitive to them.

in order to initialize the solution, put all mesh blocks into a group. then choose the constant values icon. you had better to set the initial pressure larger than outlet in order to facilitate the flow through the medium in its corrct direction.

for tutorials, i 've sent a link for you and then explained how you can download files. but unfortunately these posts were omitted by the site manager and i was punished since it was a crackers site.

regards
Hamidzoka is offline   Reply With Quote

Old   April 12, 2010, 11:50
Default
  #3
Member
 
giacomo combariati
Join Date: Aug 2009
Posts: 36
Rep Power: 7
jackr84 is on a distinguished road
In the boundary condition if i put the mass flow rate what does direction vector represnt? I have a pressure outlet 0f 90211 Pa, what do i put in the outlet?And then, to initialize the problem, what do paramater set?
jackr84 is offline   Reply With Quote

Old   April 13, 2010, 22:50
Default
  #4
Senior Member
 
Hamid Zoka
Join Date: Nov 2009
Posts: 162
Rep Power: 8
Hamidzoka is on a distinguished road
direction vector defines the direction of velocity vector entering the domain. for example if inlet flow is along the z-axis, you should easily enter 0,0,1 for x,y,z respectively.
for the output, set the 90211 as the outlet pressure. in outlet tab, select "pressure imposed". then select "averaged static pressure".
in order to initialize the problem, select "constant value" and then enter initial tempreture, pressure and velocity.

regards
Hamidzoka is offline   Reply With Quote

Old   April 14, 2010, 01:38
Default
  #5
Member
 
giacomo combariati
Join Date: Aug 2009
Posts: 36
Rep Power: 7
jackr84 is on a distinguished road
The fluid filed is not aligned with nothing axis!!!!The veocity components are:
Vx=-17,16
Vy=-19,16;
Vz=44,96
jackr84 is offline   Reply With Quote

Old   April 14, 2010, 03:41
Default
  #6
Senior Member
 
Hamid Zoka
Join Date: Nov 2009
Posts: 162
Rep Power: 8
Hamidzoka is on a distinguished road
it is just a basic concept.
calculate Vtotal magnitude easily as the following:
Vtotal=(Vx^2+Vy^2+Vz^2)^0.5
then:
x direction= Vx/Vtot
y direction= Vy/Vtot
z direction= Vz/Vtot

regards
Hamidzoka is offline   Reply With Quote

Old   April 14, 2010, 06:41
Default
  #7
Member
 
giacomo combariati
Join Date: Aug 2009
Posts: 36
Rep Power: 7
jackr84 is on a distinguished road
I did all that you said me but the errore is alway the same:
flow solver error
jackr84 is offline   Reply With Quote

Old   April 15, 2010, 03:07
Default
  #8
Senior Member
 
Hamid Zoka
Join Date: Nov 2009
Posts: 162
Rep Power: 8
Hamidzoka is on a distinguished road
did you define all boundries? is there any undefined boundary in your domain?
if you have a valid domain and defined boundaries, your problem is concerned with solver adjustments
Hamidzoka 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
Modelling catalytic converter jamesgunasekaran OpenFOAM 4 February 12, 2014 11:24
help to simulation of a catalytic converter jackr84 FLUENT 0 February 1, 2010 11:09
Modeling catalytic converter vraju_d FLUENT 0 December 11, 2009 14:18
catalytic converter fox FLUENT 3 August 7, 2008 02:30
UDF : Chemical Reaction in Catalytic Converter adhimac FLUENT 1 March 27, 2001 14:04


All times are GMT -4. The time now is 06:53.