[DP3103]

I want to add the power law velocity profile as a field function vector,

when I add it it says there's a syntax error. the Velocity is changing in the y coordinate i.e. as y increases so does the velocity. x and z are 0.

my input is

[0, 12*({Position}/300)^0.28,0]

the equation for the y coordinate is V = KnownV at Known Z * (Z/KnownZ) ^0.28.
my known z is 300 and known v is 12

can you please help thanks

[LuckyTran]

Position is a vector.

You need to grab just the y-component it of it using {Position}[1]. I forget off the top of my head if 1 is the y-coordinate, it might be {Position}[2]. You should check. The graphical interface will also let you select (i,j,k components) this if you click in the right places.

[DP3103]

Ive just checked 2 is the y coordinate. so does that mean my vector will just be

[0, 12*(({Position}[2])/300)^0.28, 0]

and that will give me a velocity profile on the velocity inlet boundary condition? My domain is from coordinat 0 to 300 so should this be ok for this?

Thanks

[DP3103]

Error: function 'User Field Function 1 (UserFieldFunction_1)' compilation error: syntax error
Unable to compile expression "[0,12*(pow((({position}[2])/300),0.28),0]"

this is my input and i am getting this error. can you please help ive been trying with the velocity profile all day and im getting nowhere!

thanks

[cwl]

1) Too many parenthesis - also an odd number of them.
2) User '$$' wheh using vector-type Field Function (like Position or Velocity) and single '$' when using scalar-type Field Function.

[0, 12*pow($${Position}[2]/300, 0.28), 0]

can you please help ive been trying with the velocity profile all day and im getting nowhere!

3) Please read the corresponding section of the user guide - Field Functions are very well described there.
It takes just couple of hourse to read it, I have no idea what you were doing all day.