The Velocity Inlet condition is used to define the flow velocity, with all scalar flow properties, in the flow inputs. In this type of boundary condition, the total properties are not constant; therefore, these properties can be increased to any amount required to describe the distribution of the velocity; so, this boundary condition can only be used for non-compressible flows, and its application In compressible flows results in non-physical output data. Also, there should not be a Velocity Inlet boundary near an obstacle or clogging because this prevents overlapping and non-uniformity of the flow input.
You can define the velocity of the flow by determining the size and direction of the velocity, determining the velocity components, or determining the perpendicular velocity of the boundary. If model has moving zones, such as MRFs or sliders it can be used both relative velocities or Absolute. For axial symmetric problems with swirl, tangential or rotational velocities must also be determined. The steps to determine the input velocity are as follows:
- Select the method used to determine the flow direction. This step is done by selecting one of the Magnitude and Direction options, Components, or Magnitude Normal in the Velocity Specification Method list.
- If the adjacent region is close to the inlet velocity zone, such as the moving regions of the MRF, relative or absolute velocity can be set by selecting one of the Relative to Adjacent Cell Zone or Absolute options in the Reference Frame. If the cellular zone adjacent to the boundary does not move, then you do not need to use this step.
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