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

FLUENT and CHEMKIN mechanism

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 5, 2012, 11:06
Default FLUENT and CHEMKIN mechanism
  #1
Super Moderator
 
diamondx's Avatar
 
Ghazlani M. Ali
Join Date: May 2011
Location: Canada
Posts: 1,291
Blog Entries: 23
Rep Power: 20
diamondx will become famous soon enough
Hello ,
i have a question , Can fluent read Chemkin mechanism input files (i.e ext.inp ) or it has to be (ext. che ) .
Thanks
__________________
Regards,
New to ICEM CFD, try this document --> http://goo.gl/G2gkE
Ali
diamondx is offline   Reply With Quote

Old   July 6, 2012, 11:30
Default
  #2
New Member
 
faramarz
Join Date: Feb 2012
Location: tehran
Posts: 5
Rep Power: 5
aerospace1365 is on a distinguished road
Send a message via Yahoo to aerospace1365
yes u can. import it from file-import-chemkine
aerospace1365 is offline   Reply With Quote

Old   July 6, 2012, 11:36
Default
  #3
Super Moderator
 
diamondx's Avatar
 
Ghazlani M. Ali
Join Date: May 2011
Location: Canada
Posts: 1,291
Blog Entries: 23
Rep Power: 20
diamondx will become famous soon enough
thanks for your reply.
does it support .inp extension or only valid for .che, coz i am getting an error msg while importing it as a .inp file .
__________________
Regards,
New to ICEM CFD, try this document --> http://goo.gl/G2gkE
Ali
diamondx is offline   Reply With Quote

Old   July 6, 2012, 14:25
Default
  #4
New Member
 
faramarz
Join Date: Feb 2012
Location: tehran
Posts: 5
Rep Power: 5
aerospace1365 is on a distinguished road
Send a message via Yahoo to aerospace1365
dear ali what is your error about. can you write it.
aerospace1365 is offline   Reply With Quote

Old   July 6, 2012, 14:37
Default
  #5
Super Moderator
 
diamondx's Avatar
 
Ghazlani M. Ali
Join Date: May 2011
Location: Canada
Posts: 1,291
Blog Entries: 23
Rep Power: 20
diamondx will become famous soon enough
Hi ,

the msg is unexpected error , 1 , line 17 and line 37 .
i have attached the file .inp (which represents the mechanisms and the Thermo. property files ) . if u can have a look and try to let it work ill be graceful
thanks .
Attached Files
File Type: zip error.zip (82.4 KB, 57 views)
__________________
Regards,
New to ICEM CFD, try this document --> http://goo.gl/G2gkE
Ali
diamondx is offline   Reply With Quote

Old   July 10, 2012, 10:30
Default
  #6
New Member
 
Ivan
Join Date: Jul 2012
Location: Russia
Posts: 3
Rep Power: 5
Ivanesus is on a distinguished road
Hi.
Fluent can use no more than 50 elements. All elements in reactions should correspond to the list in thermodynamic data. Correct the keywords. For example:
---------------- in file termo.db --------------------------
THERMO ALL
H L 6/94C 0H 1N 0O 0G 0300.00 6000.00 1000.00 1
2.5000000E+000 0.0000000E+000 0.0000000E+000 0.0000000E+000 0.0000000E+000 2
2.5473660E+004-4.4668285E-001 2.5000000E+000 0.0000000E+000 0.0000000E+000 3
0.0000000E+000 0.0000000E+000 2.5473660E+004-4.4668285E-001 2.6219035E+004 4
H2 RUS 78C 0H 2N 0O 0G 0300.00 6000.00 1000.00 1
2.9328305E+000 8.2659802E-004-1.4640057E-007 1.5409851E-011-6.8879615E-016 2
-8.1305582E+002-1.0243164E+000 2.3443029E+000 7.9804248E-003-1.9477917E-005 3
2.0156967E-008-7.3760289E-012-9.1792413E+002 6.8300218E-001 0.0000000E+000 4
O L 1/90C 0H 0N 0O 1G 0300.00 6000.00 1000.00 1
2.5436370E+000-2.7316249E-005-4.1902952E-009 4.9548185E-012-4.7955369E-016 2
2.9226012E+004 4.9222946E+000 3.1682671E+000-3.2793188E-003 6.6430640E-006 3
-6.1280662E-009 2.1126597E-012 2.9122259E+004 2.0519335E+000 2.9968701E+004 4
OH IU3/03C 0H 1N 0O 1G 0300.00 6000.00 1000.00 1
2.8385303E+000 1.1074129E-003-2.9400021E-007 4.2069873E-011-2.4228989E-015 2
3.6978081E+003 5.8449465E+000 3.9919842E+000-2.4010665E-003 4.6166403E-006 3
-3.8791631E-009 1.3631950E-012 3.3688984E+003-1.0399848E-001 4.4861538E+003 4
END
------------- in file reactions.mec ---------------
ELEMENTS
H O
END
SPECIES
H
H2
O
OH
END
REACTIONS
O+H2=OH+H 5.13E+004 2.67 6290.0
END
------------- in file transport.db --------------------
H 0 145.000 2.050 0.000 0.000 0.000
H2 1 38.000 2.920 0.000 0.790 280.000
O 0 80.000 2.750 0.000 0.000 0.000
O2 1 107.400 3.458 0.000 1.600 3.800
OH 1 80.000 2.750 0.000 0.000 0.000
----------------------------------------------------

Council - look for the reduced mechanism for the task if only you aren't engaged in studying of formation of any element in detail. The mechanism given by you will be too expensive for calculation CFD.
Ivanesus is offline   Reply With Quote

Old   September 8, 2013, 07:57
Default LPG chemkin file
  #7
New Member
 
Nidhi Tiwari
Join Date: Sep 2013
Posts: 1
Rep Power: 0
nidhitw is on a distinguished road
Hi,

I am working on a problem with LPG +air mixture. Does anybody have chemkin file for LPG ?

Nidhi
nidhitw is offline   Reply With Quote

Old   April 13, 2015, 17:47
Default
  #8
Member
 
sanjeet Limbu
Join Date: Mar 2015
Posts: 91
Rep Power: 2
sanjeetlimbu is on a distinguished road
Dear sir

i am trying the same work , using aLiu mechanism- 43 species but the file i got is showing error when i try load to PDF create box for line numder 4 in chemkin .che and some line in .db thermal file


I have attached the mechnaism mother file as txtx and the thermal , chemicak kinetc , trans file i seperated from that . but still it shows some error.
Though i used it in chemkin i worked there

Can u please share me by checking the fault lines... at slimbu@mtu.edu
Attached Files
File Type: zip G Mittal.zip (14.0 KB, 11 views)
sanjeetlimbu is offline   Reply With Quote

Old   April 14, 2015, 04:48
Default
  #9
New Member
 
Join Date: Oct 2011
Posts: 23
Rep Power: 5
chittipo is on a distinguished road
Hi this may be ^M issue at the end of some lines and starting of empty lines. you could delete this character in vi editor if you are in linux. google it how can you delete this character
some suggestions: why do you use spaces in file name? please use proper editor to open these files in windows.

can you try now the attached, I have deleted this character for you now.

G_Mittal.zip
chittipo is offline   Reply With Quote

Old   April 20, 2015, 12:23
Default
  #10
Member
 
sanjeet Limbu
Join Date: Mar 2015
Posts: 91
Rep Power: 2
sanjeetlimbu is on a distinguished road
Hi I am trying to use the chemkin file for nheptane Liu mechanism .. I added the Argon in this to get the results for my mixture - partially premised commbustion of N2/Ar/O2/nC7H16: 58/30/10.307/0.00562 by mole fraction .

I updated the .che and .db files for upload and creating pdf in species dialog box..
Got the error can u see my file and tell corrections needed ..


I am doing the compression and post compressed ignition after 30 millisec
Attached Images
File Type: jpg PDF creation.jpg (72.2 KB, 12 views)
File Type: jpg species chemkin import results.jpg (68.5 KB, 9 views)
sanjeetlimbu is offline   Reply With Quote

Old   April 21, 2015, 02:39
Default
  #11
New Member
 
Join Date: Oct 2011
Posts: 23
Rep Power: 5
chittipo is on a distinguished road
Hi,
As of now this is not an error. For all the missing species Fluent sets constant property evaluation (it appears so). You need to input this constant value in respective property terminal for thermal counductivity and viscosity.

why and how to avoid these messages:
---------------------------------------
it means, either you do not have the species listed on Fluent terminal (ph.../px2...) in your *.db file or Fluent failed to ready due to some error in the *.db file. Can you check whether all the species listed in your *.che are available in *.db file. You probably have them for Cp evaluation in therm.db file and do not have them in transport data base file.

Do not worry if you do not have them in transport data base, as you see Fluent set to constant property in that case. But make sure you enter approximate right value for it.
chittipo is offline   Reply With Quote

Old   April 22, 2015, 18:52
Default
  #12
Member
 
sanjeet Limbu
Join Date: Mar 2015
Posts: 91
Rep Power: 2
sanjeetlimbu is on a distinguished road
Dear sir
I am unable to get the compression stroke in closed system to make temperature rise.. but pressure rise. It is 2D axisymetric case
Can U suggest reason

I feel I am not having the initialisation values correct... or some thing in species model is missing for compression
Attached Images
File Type: jpg initialisation.jpg (66.3 KB, 7 views)
File Type: jpg density pdf.jpg (45.8 KB, 7 views)
File Type: jpg material.jpg (39.5 KB, 8 views)
File Type: jpg result for max Temp and Presuree.jpg (31.0 KB, 6 views)
File Type: jpg results at 35ms.jpg (27.7 KB, 7 views)

Last edited by sanjeetlimbu; April 22, 2015 at 20:56.
sanjeetlimbu 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
[FLUENT] Reacting flow with CHEMKIN mechanism entropies ANSYS 0 December 25, 2011 02:04
unit conversion of pre-exponential factor A of chemkin mechanism in Fluent newbie FLUENT 5 November 14, 2010 06:44
Chemkin CFD for Fluent divyatman FLUENT 1 July 20, 2009 13:44
chemkin -> fluent Tomasz ochrymiuk Main CFD Forum 0 March 16, 2000 06:55
chemkin -> fluent Tomasz Ochrymiuk FLUENT 0 March 16, 2000 06:11


All times are GMT -4. The time now is 02:35.