[hamed1387]

Hi

I have a very important question. Thanks in advance for your help.

The "ansys fluent theory guide 15.0", on the section"Discrete ordinates radiation model theory" states that:

"The discrete ordinates (DO) radiation model solves the radiative transfer equation (RTE) for a finite number of discrete solid angles, each associated with a vector direction S fixed in the global Cartesian system (x,y,z)."

My question: How many solid angles are there for the bellow beam width conditions? How many solid angles are common, generally?
Theta (deg): 1e06
Phi (deg): 1e06

Thanks so much.

[Светлана]

It is not clear to me what conditions you would like to set. A one million theta or phi does not make sense to me personally. Where did you take that from and in what context?

For an introduction to the solid angle concept, I would recommend https://marine.rutgers.edu/dmcs/ms55...solidangle.pdf . The whole sphere is represented by 4*pi solid angle.

[hamed1387]

Originally Posted by Светлана

It is not clear to me what conditions you would like to set. A one million theta or phi does not make sense to me personally. Where did you take that from and in what context?

For an introduction to the solid angle concept, I would recommend https://marine.rutgers.edu/dmcs/ms55...solidangle.pdf . The whole sphere is represented by 4*pi solid angle.

Thanks for recommending the file. In fact, I selected the default conditions defined in the fluent and would like to know how many solid angles the fluent considers in its default conditions. I want to know what parameters in the fluent determine the quantity of solid angles and how?

In the following, the "ansys fluent theory guide 15.0" gives a description about number of solid angles: https://www.uplooder.net/img/image/9...pixelation.PNG

[Светлана]

It is shown in the figure provided. A location is determined by dtheta and dphi ranges.

[hamed1387]

I found that we can determine the number of solid angles in the angular discretization box (theta and phi divisions). In fact, for a 3D model, a number of 8NN solid angles and for a 2D model, a number of 4NN will be solved.