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Operating Parameters

The operating parameters pertaining to the Propeller template involve the time definition for the simulation, pump configuration, angular velocity definitions for propeller rotation and other advanced/extended settings (see, Figure 8.80).

 

 

 

 

Figure 8.80 - Propeller model-Operating parameters

Time Definition

 This provides three options to specify the size and number of time-steps to be performed for a given simulation (see, Figure 8.80):

1. Revolutions: A single revolution corresponds to a propeller rotation of 360 degrees. The parameters required under the Time Definition of Revolutions are:

• Number of Revolutions: The number of propeller revolutions to be simulated.
• Time Steps Per Pocket Rotation: The number of time steps taken to move a blade one pocket.

	8.17
	8.18

For a Time Definition, the Number of Time Steps is computed based on the Number of Blades, Number of Revolutions, and the Time Steps Per Pocket Rotation as follows:

8.19

Pockets: A method of Time Definition that uses the angle from one propeller blade to the next to determine the size and number of time steps. A single pocket corresponds to a rotation equal to the average angle between blades, based on 360 deg divided by the user specified Number of Blades. The parameters required under the Time Definition of Pockets are:

• Number of Pockets : This dictates the amount of rotation based on the angle between two blades.
• Time Steps Per Pocket Rotation

 

 

 

 

Figure 8.81 - Pocket-Propeller

For a Time Definition of Pockets, the Number of Time Steps is computed based on the Number of Pockets and the Time Steps Per Pocket Rotation as follows :

8.20

Total Time Steps:Total number of time steps for a given simulation. The following parameters are specified for this Time Definition:

• Time Steps Per Pocket Rotation
• Number of Time Steps

For a Time Definition of Total Time Steps, Number of Time Steps may also be specified directly in the Simulation Panel.

Note: If the Number of Time Steps is displayed in Blue, it means that it is set and controlled elsewhere and cannot be changed in the Simulation Panel. The setting of Time Definition in the Properties Panel and in the Simulation Panel are slaved to each other, such that changing the value in one panel, changes the value in the other.

Propeller (Pump) Configuration

A category for parameters pertaining to the geometry of the propeller (see Figure 8.80).

• Number of Blades: The number of blades in the propeller.
• Rotor Center: Rotational center of propeller.

 

 

 

 

Figure 8.82 -  Number of blades

Angular Velocity Definition

This contains parameters pertaining to the rotation of the propeller. The angular velocity definition depends on the values assigned for the parameters Rotational Direction, Rotational Speed and Rotational Axis Vector (see Figure 8.80 for options).

 

 

 

 

Figure 8.83 -  Angular velocity definition