• Specified Values—Specifies the initial velocity and pressure field for a selected nonrotating volume.

• Rotating System—Specifies the initial velocity and pressure field for a selected rotating volume. Rotating System is defined using the following: Pressure, Rotational Units, Rotational Direction, Rotational Speed, Rotational Center, Rotational Axis Vector and Axial Velocity Component.

◦ The default value of the Axial Velocity Component is 0.1 (m/s).

◦ For a Steady state solution, the initial Axial Velocity Component sometimes improves convergence for Steady state solution and is the default for Steady state solution instead of 0. This default should have no impact on the final solution. However, for the sake of convergence, initial conditions should be as close to the solution as possible.

◦ For a Transient solution, the initial Axial Velocity Component represents the axial velocity at time equals zero and the initial conditions represent the Flow and Pressure fields at time equals zero. After a Transient solution achieves steady or periodic conditions, the initial conditions have no impact on the solution. However, prior to achieving steady or periodic conditions, the initial conditions impact the solution and should represent physical values at time equals zero or be as close to the final solution as possible.

◦ If the State of the volume is set to Blanked, the value of the axial velocity in the volume is frozen to the initial Axial Velocity Component. This may be incorrect if the value does not correspond to what would be physically realistic, such as if the default of 0.1 m/s axial velocity is displayed in a solid.