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

udf electronic potential boundary.

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 22, 2006, 10:16
Default udf electronic potential boundary.
  #1
shuqin
Guest
 
Posts: n/a
Hi,everybody I want to model a chemical reaction in which current is produced.I model the specie production and consumption by applying a mass source term and a specie source term in the cells adjacent to the reactive wall,and it works well.

then I define a UDS (the scalar represents the elctronic potential )to resolve a laplace equation since there current is produced in the chemical reaction. and it was OK to solve a laplace equation with one wall (the wall opposite to the reactive wall )electric potential given and the reactive wall current density given.

but ACCESS_VIOLATION Error came out when the time i want to define the electric potential as a function of the specie mole fractions at the reactive wall,the function is like this :

V=S1+S2*In(Y_H2/Y_H2O)

where S1 and S2 are constant value and Y_H2 Y_H2O denotes mole fractions of hydrogen and water vapor.

I calcaulate the part:In(Y_H2/Y_H2O)of the potential profile function with DEFINE_ON_DEMAND,since we could not get specie mass fraction of the boundary wall through F_YI(f,t,i),and I use the value of C_YI(c0,t0,i)as the specie mass fraction at the reactive wall to calculate the specie mole fraction and In(Y_H2/Y_H2O).

so where am I wrong?

and can someone tell me how to deal with it?
  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
Import problem ARC Open Source Meshers: Gmsh, Netgen, CGNS, ... 0 February 27, 2010 11:56
about using the udf to impose dt/dz=0 boundary FengYun FLUENT 0 December 17, 2005 12:01
boundary conditions' type (UDF) Doru Grosan FLUENT 0 August 24, 2005 10:22
UDF for transient boundary condition? Shankar FLUENT 1 November 22, 2003 09:10
udf for boundary types?? Kai Kang FLUENT 0 March 17, 2000 13:42


All times are GMT -4. The time now is 11:22.