Error in stating units for expression for velocity profile

- December 5, 2019 at 12:42 pm
  
  DylCG10
  Subscriber
  
  Hi,
  
  I'm trying to enter a function for a velocity profile: 5 * exp(-Position.y **2/Position.x**2), and when I try to enter this expression into the inlet boundary conditions I get an error saying 'incorrect expression unit. Requires [m s^-1]'.
  
  When I try to enter the units into the expression box, I got errors saying "'m' is not defined' and even when I try other units such as 'sec' it still doesn't work. I have tried '[m/s]' and '[m s^-1]' and ', where I am typing the units after the expression. I would really appreciate if someone could please fix this for me! Thank you.
  
  P.S I am using ANSYS Fluet (Student version)
- December 5, 2019 at 4:11 pm
  
  DrAmine
  Ansys Employee
  
  What about using directly the alias x and y. Don't forget to make the expression in the exp function dimensionsles. The whole expression to be multiplied by 1[m s^-1]
- December 6, 2019 at 11:07 pm
  
  DylCG10
  Subscriber
  
  How do I make the expression dimensionless and how do I use aliases? Sorry, I'm new.
- December 7, 2019 at 7:00 am
  
  DrAmine
  Ansys Employee
  
  Learning by doing.
  You might divide the positions by 1[m].