/ in Turbulent flow / by

### Define Flow Direction

We can directly determine the flow direction at the pressure inlet or define the direction of the flow over the boundary (Normal To Boundary). If we choose the Direction Vector, we can use either the Cartesian or cylindrical coordinate systems. In order to solve problems in which there are moving zones, if the Pressure-Based is selected, depending on whether the Solver panel determines how the velocity formulation is performed relative to the velocity of the cells based on absolute (Absolute) or not, the flow direction Can be relative or absolute.

The steps for determining the flow direction in the Pressure Inlet panel are as follows:

1. Select the method used to express the flow direction. This is done by selecting the Direction Vector or Normal To Boundary in the Direction Specification list.
2. If the option 1 is set to Normal To Boundary, no other input is needed for the flow direction, and the stream will flow vertically across the boundary of the problem.
3. If in step 1 the direction vector option is selected, the coordinate system should be selected.
• The Cartesian coordinate system is determined by the Cartesian coordinate system used in geometry.
• The cylindrical coordinate system is determined based on axial, radial and tangential components.

On issues that have multiple zones, such as the rotating regions (MRFs) or sliding zones, the coordinate system is rotated through the Solid-Fluid Panel for the fluid region

Or solid) that is adjacent to the input. • On issues that have a cellular area, the coordinate system is rotated by the axis

The flow source is defined in the Fluid panel. For all the above cases in the cylindrical coordinate system, positive radial velocities represent the output along the radius of the rotation axis. Positive axial velocities are also in the direction of the axis of rotation vector and the tangential positive velocities are based on the right-hand principle with respect to the application of the axial direction axis.

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#### Pressure-Inlet Boundary Condition

The Pressure Inlet boundary condition is used to define the fluid pressure in the flow inlet with all scalar flow…

#### Static pressure definition

If the inlet flow is ultrasonic or if the user is asked to initialize the solution based on the pressure…