[Anna Tian]

Hi,

Two questions:

1. How to set tan(15 degrees) as the value of the input parameter? Fluent tells that it only accept a real value. CFX can do this easily. So I guess there should be a way for Fluent to do this.

2. I'd like to set a input parameter as a force vector in the Fluent monitor. But fluent also doesn't accept it. May I ask how to set it?

[Kokemoor]

1.) As far as I know, Fluent isn't able to do this directly, but Workbench can. You can define your input parameter in Fluent, then go back to Workbench and give it an expression rather than a value. This can also be a function of other parameters.

2.) I'm not sure about this, besides the possibly inconvenient solution to calculate it yourself from the components after the fact.

[blackmask]

If you use TUI (text user interface) you could use scheme to do that.

> (define rad (lambda (x) (* (atan 1) (/ x 45))))
> (define tand (lambda (x) (tan (rad x))))
> (tand 15)
0.26794919

[Pierre1]

Originally Posted by Kokemoor

1.) As far as I know, Fluent isn't able to do this directly, but Workbench can. You can define your input parameter in Fluent, then go back to Workbench and give it an expression rather than a value. This can also be a function of other parameters.

2.) I'm not sure about this, besides the possibly inconvenient solution to calculate it yourself from the components after the fact.

I tried Workbench to achieve this. But I'm still not able to give any expression to Force Vector as indicated in the attached figure.

[Kokemoor]

My suggestion would be to create multiple output parameters from Fluent, one for each coordinate direction (F_X, F_Y, F_Z), then create another parameter in Workbench that calculates the vector in the desired direction from those components. e.g. in 2D, F_X*cos(theta)+F_Y*sin(theta), where theta is another input parameter.

[Pierre1]

Originally Posted by Kokemoor

My suggestion would be to create multiple output parameters from Fluent, one for each coordinate direction (F_X, F_Y, F_Z), then create another parameter in Workbench that calculates the vector in the desired direction from those components. e.g. in 2D, F_X*cos(theta)+F_Y*sin(theta), where theta is another input parameter.

I see. So you compute the vectors all in Workbench.

[Kokemoor]

Yeah, I think that's probably the simplest way. I'm pretty sure you could do it in scheme, maybe even in a single output parameter, but doing it in Workbench would be straightforward and reliable.