[Mohammad74]

Hello,

I want to model a wind turbine in ansys fluent using actuator line theory and source term macros. I came across the questions below and I havent been able to find their answers:

1. How can I read the velocity at a point (with known coordinates) in the domain? I know that i can loop over all the cells to find the cell that I'm looking for, but Is this the only way? or is there another more straightforward macro that does not need a cell loop across all of my domain?

2. Also I'm using DEFINE_ADJUST macro to run my momentum source algorithm at every iteration. But since this is a transient simulation, how can I use different time steps in my UDF? I mean to read velocity at a point in different time steps or moving the location of momentum source terms in the domain.

Thanks

[AlexanderZ]

1. I don't know other way, this is the most straightforward
2. To define source you you want use define_source macro, isn't it
define_adjust is macro to be executed before each iteration/timestep
you can read your velocity, modify coordinates and whatever at any moment

[pakk]

1. CX_Find_Cell_With_Point used to work, but is undocumented and I really don't know if it still works.

Once you used this to find the cell in which the coordinate is, the rest is easier.