Index

Assign the stream function

Ver: 0
 

DESCRIPTION

For 2-D incompressible flow problems, a scalar stream function can be calculated by means of a Poisson equation with boundary conditions which are defined by the calculated velocity field. The value of the stream function is, however, defined up to an arbitrary constant.

In order to solve a well-posed problem, one must impose the value of the stream function at one point within the domain. For this purpose, the user selects a spatial position within the domain. The value of the stream function is set to zero at the node closest to that spatial position; the default value of that point is x = y = 0.

  OPTIONS
 
-1
 Upper level menu
i
 Stream function condition for velocity field i
Selecting this option allows the user to modify the position where the stream function vanishes
SEE ALSO
  • Boundary conditions (UM)
  • Momentum equations (UM)
  • Post-processors / Stream function (UM)