CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

create solid viscosity UDF in fluidized bed

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

LinkBack Thread Tools Search this Thread Display Modes
Old   June 22, 2007, 12:16
Default create solid viscosity UDF in fluidized bed
Posts: n/a
Hi my friend, please help me for create solid viscosity UDF in fluidized bed simulation. I creat below experssion in C++ as example, but i don't know that this experssion is correct or not, please guide me. thanks for your attention.
  Reply With Quote

Old   June 22, 2007, 12:19
Default Re: create solid viscosity UDF in fluidized bed
Posts: n/a
My UDF is: #include "udf.h" #define pi 4.*atan(1.) #define maxvoid 0.63 #define es 0.9 #define diam2 2.75e-4

DEFINE_PROPERTY(cell_solid_viscosity, cell, thread) { real rho_s,void_s,grant,rdf,vdrs,ali,ziri,miuscv,miuskv ,mius;

/* find phase velocities and properties*/

rho_s = C_R(cell, thread);

void_s = C_VOF(cell, thread);/* solid vol frac*/

/* find solid phase properties*/

rho_s = C_R(cell, thread); grant=C_GT(cell,thread);

/* find below value */ vdrs = void_s*diam2*rho_s*sqrt(grant*pi); ali = 1+(1+es)*(1.2*es-0.4)*(void_s*rdf); ziri = 6*(3-es); /* compute radial distribution function */ rdf = (3/5)*pow((1-pow((void_s/maxvoid), 0.33333)),-1); /* compute solid collition viscosity */ miuscv = 0.8*void_s*rho_s*diam2*rdf*(1+es)*pow((grant/pi),0.5); /* compute solid kinetics viscosity */ miuskv = vdrs*ali/ziri; /* compute solid shear viscosity */ mius = miuscv + miuskv; return mius; } thanks.
  Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
expansion of bed in fluidized bed achy7pch FLUENT 3 February 16, 2016 06:21
Fluidized bed modeling Kartus CFX 9 June 30, 2011 04:41
Viscosity for solid dispersed phase in E-E modelin Kushagra FLUENT 0 June 27, 2008 19:01
modeling a fluidized bed?? Maxim FLUENT 2 January 5, 2003 22:27
CFX4.3 -build analysis form Chie Min CFX 5 July 12, 2001 23:19

All times are GMT -4. The time now is 23:30.