[ngoctm]

Hello everyone,

I want to assign the sinusoidal current for volume of electrodes for representing the three-phase AC supply to the electrodes. The current inputs, were specified as equal in magnitude but with a phase lag of .

i=Im.sin(2.f.t+)/

Could you help me to setup this input.

Thank you in advance.
NgocTM

[ngoctm]

Hello Everyone,

I have received an advice to set up this function. But I don't know which is the correct syntax for sin function between 2 functions below:

#include "udf.h"
#define FREQ 50 /*Hz*/
#define PI 3.1415
DEFINE_SOURCE(j_source,c,ct,ds,eqn)
{
real CURR = 1200.0;
real VOLTA = 180.0;
real VOLUM = 0.002157;
real source1;
source1 = VOLTA*CURR/VOLUM*sin((2.0*PI*FREQ*CURRENT_TIME+90.0)*PI/180.0);
ds[eqn] = 0.0;
return source1;
}

Or

#include "udf.h"
#define FREQ 50 /*Hz*/
#define PI 3.1415
DEFINE_SOURCE(j_source,c,ct,ds,eqn)
{
real CURR = 1200.0;
real VOLTA = 180.0;
real VOLUM = 0.002157;
real source1;
source1 = VOLTA*CURR/VOLUM*sin(2.0*PI*FREQ*CURRENT_TIME+90.0*PI/180.0);
ds[eqn] = 0.0;
return source1;
}

Could you please give me some advice?

Thank you in advance!

NgocTM

[SanchoBuendia]

Hi, I'm trying to build a model, rectangular channel with cathode on the inside and anode on the outside, but I don't know how more that. Could you help me?

[sina_sls]

Originally Posted by ngoctm

Hello everyone,

I want to assign the sinusoidal current for volume of electrodes for representing the three-phase AC supply to the electrodes. The current inputs, were specified as equal in magnitude but with a phase lag of .

i=Im.sin(2.f.t+)/

Could you help me to setup this input.

Thank you in advance.
NgocTM

Hello

I want to set sinusoidal value of electric potential (MHD module) for a wall, first i try expression but i faced to error :

Error: wta(2nd) to string_eq

Error Object: __expr__

then i try Profile and UDF profile , but agian i faced to problem , when i use them it consider the wall to insulated.

Could you help me how can i set sinusoidal value for current density ( Electric Potential MHD) ?

Best Regards,

[AlexanderZ]

show your code, show compilation log, explain the error in details

[sina_sls]

Originally Posted by AlexanderZ

show your code, show compilation log, explain the error in details

Thank you for your response,

this is my UDF profile code that when i select it for a wall , MHD module consider the wall as insulated:

#include "udf.h"
#define PI 3.141592654

DEFINE_PROFILE(current_density,thread,position)
{

face_t f;
real t = CURRENT_TIME;

begin_f_loop(f,thread)
{

F_PROFILE(f,thread,position)=13*sin((2*PI/0.04)*t);

end_f_loop(f,thread)
}
}

This is expression :

13*sin((2*PI/0.04[s])*Time)

when i use it and then go to MHD module Box it show this error :


Error: wta(2nd) to string_eq
Error Object: __expr__

and fluent didn't run and show this :
======Message from the Cortex Process========

Compute processes interrupted. Processing can be resumed.

===================================

[Niicho]

Hello sina_sls,

Did you manage to solve your problem? I am experiencing a similliar issue! thank you in advance!