CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Help me to solve this thorny problem

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

LinkBack Thread Tools Display Modes
Old   November 22, 2002, 12:59
Default Help me to solve this thorny problem
Posts: n/a
Today , i have a very thorny problem .

My model has a parameter was used to predict the binary diffusion coefficient (Dij) at species transport equation .

For example Dij = 3.64*e-8* T^2.334*(Pci*Pcj)^0.3333*(Tci*Tcj)^-0.48625*(1/Mi+1/Mj)^0.5

{Pci---critical pressure of species i Pcj---critical pressure of species j Tci---critical temperature of species i Tcj---critical temperature of species j }

In my model ,five species was be existed indie the model . H2,O2,H2O,CO2,N2

i want to solve the Dij from above equation . so. i also wrote a program of UDF by visual C++

Unfortunately , this program is wrong in FLUENT . Who can assist to modify this thorny program ??

Best regrad to you



{ int i,j;

real Dij;

if(i==0. || j==1.)

{C_DIFF_L(cell,thread,0,1)=3.64e-8*pow(C_T(cell,thread),2.334)*pow((Pc0*Pc1),1/3)*pow((Tc0*Tc1),-0.48625)*((1/M0+1/M1),1/2); /*Laminar species diffusivity */

Dij=C_DIFF_L(cell,thread,0,1); }

else if(i==0. || j==2.)

{C_DIFF_L(cell,thread,0,2)=3.64e-8*pow(C_T(cell,thread),2.334)*pow((Pc0*Pc2),1/3)*pow((Tc0*Tc2),-0.48625)*((1/M0+1/M2),1/2); /*Laminar species diffusivity */

Dij=C_DIFF_L(cell,thread,0,2); }

else if(i==0. || j==3.)

{C_DIFF_L(cell,thread,0,3)=3.64e-8*pow(C_T(cell,thread),2.334)*pow((Pc0*Pc3),1/3)*pow((Tc0*Tc3),-0.48625)*((1/M0+1/M3),1/2); /*Laminar species diffusivity */

Dij=C_DIFF_L(cell,thread,0,3); }

else if(i==0. || j==4.)

{C_DIFF_L(cell,thread,0,4)=3.64e-8*pow(C_T(cell,thread),2.334)*pow((Pc0*Pc4),1/3)*pow((Tc0*Tc4),-0.48625)*((1/M0+1/M4),1/2); /*Laminar species diffusivity */

Dij=C_DIFF_L(cell,thread,0,4); }


{C_DIFF_L(cell,thread,1,2)=3.64e-8*pow(C_T(cell,thread),2.334)*pow((Pc1*Pc2),1/3)*pow((Tc1*Tc2),-0.48625)*((1/M1+1/M2),1/2); /*Laminar species diffusivity */ Dij=C_DIFF_L(cell,thread,1,2); }

return Dij; }

  Reply With Quote

Old   November 24, 2002, 01:43
Default Re: Help me to solve this thorny problem
mahdi saniee nezhad
Posts: n/a
Dear sir I have a problem with this title. If it's possible for you please send me your received responses. Very thanks for your attention to my request. With the best regards. Mahdi saniee nezhad

  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
how to solve large scale problem send1000 ANSYS 0 September 3, 2011 13:46
how to solve a problem involving both laminar and turbulent flow seefd FLUENT 1 June 3, 2011 03:20
Can CFX solve problem with structured mesh? Peted CFX 2 May 31, 2004 23:45
how to solve this problem in CFX5 calculation? cfxbeginer CFX 2 May 1, 2003 08:55
Can I use fluent to solve this multiphase problem Steven FLUENT 1 January 24, 2003 21:52

All times are GMT -4. The time now is 17:12.