By E E Khalil
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The selected turbulence model, in the form of a set of steady partial differential equations, allows the predictions of the aerodynamics properties of the flow. The various assumptions, limitations, and required convergence criteria to satisfy the conservation equations are also discussed later. 2) sys where the integration is over the volume of the system. 2 states that the system mass is equal to the sum of all the density-volume element products for the contents of the system. 3 can express the time rate of change of the system mass as the sum of two control volume quantities, the time rate of change of the mass of the contents of the control volume, and the net rate of mass flow through the control surface.
The partial differential equation is integrated over the control volume with the aid of Φ and the rates of generation/destruction of the entity Φ within the cell and its transport by convection and diffusion across the cell boundaries. 70) when Pew is large Here the subscripts P and W refer to the central and west nodes, respectively, and w denotes the intervening cell boundary. 70) at cells adjoining the boundaries of the solution domain to account for the conditions imposed there. 77) and similarly for all velocities components.
Similarly, data must be submitted showing the sound power level for all eight octave bands that will be achieved when tested. The fan curves shall clearly show the duty point and absorbed power to ensure stable operating conditions and a minimum margin of 20% between absorbed and motor power. Motors shall be mounted on slide rails for easy belt tensioning, and be totally enclosed and fan cooled with F class insulation. Twin-speed motors shall be made available where specified. Motors shall drive heavy duty V-belts.