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-   -   About Lorentz force (http://www.cfd-online.com/Forums/fluent/28445-about-lorentz-force.html)

Li San April 17, 2001 08:30

About Lorentz force
 
I plan to simulate the natural convection of aqueous solutions of sodium chloride in a cubic cell under a uniform magnetic field. Would you please give a hand to tell me how to do it using fluent? Thanks in advance.

Rüdiger Schwarze April 19, 2001 07:45

Re: About Lorentz force
 
You have two possibilities: Either You can calulate the Lorentz force directly in a user-definied subroutine or You teat the lorentz force as a user-defined scalar.

Li San April 19, 2001 08:11

Re: About Lorentz force
 
Dear Rüdiger Schwarze, Thank you very much. I am a new comer. I think I should use user-defined subroutine. But I have no such kind of experiment. Could you give me a hand? How about send me a sample? Thanks in advance. Li

Rüdiger Schwarze April 19, 2001 10:58

Re: About Lorentz force
 
Lorentz force density in x:

DEFINE_SOURCE(x_imp, cell, thread, dS, eqn) {

/* variables */

float jz, by, source; float x[ND_ND];

/* coordinates of cell center */

C_CENTROID(x,cell,thread);

xk = x[0];

yk = x[1];

jz = f(xk,yk); /* eddy current density, deduced from analytical formula */

by = f(xk,yk); /* magnetic flux density, deduced from analytical formula */

source = -jz*by;

dS[eqn] = 0.0;


Li San April 19, 2001 21:18

Re: About Lorentz force
 
Thanks a lot. I will try it.

kcgmech October 29, 2014 09:04

Quote:

Originally Posted by Rüdiger Schwarze
;96788
Lorentz force density in x:

DEFINE_SOURCE(x_imp, cell, thread, dS, eqn) {

/* variables */

float jz, by, source; float x[ND_ND];

/* coordinates of cell center */

C_CENTROID(x,cell,thread);

xk = x[0];

yk = x[1];

jz = f(xk,yk); /* eddy current density, deduced from analytical formula */

by = f(xk,yk); /* magnetic flux density, deduced from analytical formula */

source = -jz*by;

dS[eqn] = 0.0;

how to get the current density and magnetic flux terms from the analytical formula? could you please give some information on this?


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