Learning Forum

[maliuzair]

Hi

 

I am simulating a three phase flow, and i want to write a udf  for solid solid interaction.
SYAMLAL OBREIN SYMMETRIC DRAG MODEL

I am facing two problems.

1) when i interpret udf, it shows me undeclared variable

line 19: l_col: undeclared variable

AND

`DEFINE_EXCHANGE_PROPERTY' used with too many (6) args

 

 

2) I dont know how to include radial distribution function in the udf

Can someone please point out the flaws and how to fix them

[maliuzair]

https://www.dropbox.com/s/520xz5whxkggghl/drag.txt?dl=0

[Keyur Kanade]

Hi, 

As ANSYS Engineer, we can not download from forum. Can you please insert some images. 

Thanks!

Regards,

Keyur

[Keyur Kanade]

Also moving this to Fluid Dynamics category for better response. 

Regards,

Keyur

[DrAmine]

The documentation contains an example how to apply DEFINE_EXCHANGE_PROPERTY. As you are directly writing the whole Kpq term you do have to account for everything on your own. 

Are the drag laws implemented in Fluent for granular not sufficient for your application? 

[maliuzair]

Sir,

I have solved first problem, but

I am still unable to include radial distribution function in the udf. Since there is a term of radial distribution function Go,ls in the equation. Can I recall it just like any other variable in the cell e.g. void fraction? How?

I am attaching screenshots for the udf and equation
P.S. I am just a beginner.

Best 

[maliuzair]

Dear Sir,

I have to include shape factor in the udf. I have accounted for that in primary phase and secondary phase interaction. But for solid-solid interaction; I dont know how to include radial distribution coefficient go,ls in the udf.

Best

[DrAmine]

There is no documented macro to access the g0 function.

[maliuzair]

dear sir

can you advise how to solve the problem

Best Regards