How to get the coordinates and velocities at the grid center and nodes simultaneously

maye761 · October 7, 2009, 07:36

when fluent is calculating, i want to export the coordinates and velocities at the grid center and nodes together to a data file. How should I do?

Häwimeddel · October 12, 2009, 11:58

Do you want to do this for every iteration?

Anyway, the macros you are looking for are

Code:

C_CENTROID(x,c,t); //coords of cell centre
C_U(c,t) //flow velocity x
C_V(c,t) //flow velocity y
C_W(c,t) //flow velocity z

Just loop over all the cells in the domain with

Code:

begin_c_loop(cell,thread) 
{
}
end_c_loop(cell,thread)

crazyman · October 12, 2009, 14:40

hey hi i want to know how do we define heat source in fluent

maye761 · October 18, 2009, 23:48

Well, this is the macros for velocities at center of cells. How to export velocities at nodes?

Häwimeddel · October 19, 2009, 03:41

I don´t believe there are any macros for getting the velocities at the nodes. I believe Fluent only solves the velocities for the cell centres. You would have to interpolate betwen the cell centre velocities to get a value for the velocities at the nodes.

October 7, 2009, 07:36	How to get the coordinates and velocities at the grid center and nodes simultaneously	#1
maye761 New Member maye Join Date: Oct 2009 Posts: 9 Rep Power: 17	when fluent is calculating, i want to export the coordinates and velocities at the grid center and nodes together to a data file. How should I do?

October 12, 2009, 11:58		#2
Häwimeddel New Member Join Date: Apr 2009 Location: KA, Germany Posts: 20 Rep Power: 17	Do you want to do this for every iteration? Anyway, the macros you are looking for are Code: C_CENTROID(x,c,t); //coords of cell centre C_U(c,t) //flow velocity x C_V(c,t) //flow velocity y C_W(c,t) //flow velocity z Just loop over all the cells in the domain with Code: begin_c_loop(cell,thread) { } end_c_loop(cell,thread)

October 12, 2009, 14:40		#3
crazyman New Member anonymous Join Date: Aug 2009 Posts: 4 Rep Power: 17	hey hi i want to know how do we define heat source in fluent

October 18, 2009, 23:48		#4
maye761 New Member maye Join Date: Oct 2009 Posts: 9 Rep Power: 17	Well, this is the macros for velocities at center of cells. How to export velocities at nodes?

October 19, 2009, 03:41		#5
Häwimeddel New Member Join Date: Apr 2009 Location: KA, Germany Posts: 20 Rep Power: 17	I don´t believe there are any macros for getting the velocities at the nodes. I believe Fluent only solves the velocities for the cell centres. You would have to interpolate betwen the cell centre velocities to get a value for the velocities at the nodes.