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accuracy and the cost of calculation, grid size 2 has been selected for all simulations in this study. Total number of elements for a single stage simulation (including inlet extension, injectors, stator, and rotor) in configuration 1 is 12.2 M. IV.5. Numerical Method and Boundary Conditions ANSYS CFX 17.1 is used for the CFD simulations. As mentioned before, periodic boundary conditions are used to reduce the size of the computational domain. Rotational periodic boundary condition around the turbine axis of rotation simulates a complete row of blades for each component. In order to establish the unsteady simulation, a steady solution with frozen rotor interface between the stator and rotor components is used as the initial guess. In frozen rotor, the frame of reference is changed but the relative orientation of the components across the interface is fixed [88]. The interfaces are changed to Transient Rotor Stator as the unsteady solution is started. In this approach, the transient relative motion between the sliding components on each side of the connection is simulated. It accounts for all interaction effects between the components that are in relative motion with regards to each other, i.e. stators and rotors. The interface position is updated at each timestep, as the relative position of the grids on each side of the interface changes [88]. The interface between the stationary components such as injectors and stator is a general connection with no change in relative frame positions. For the boundary conditions, total pressure and total temperature are specified at the inlet along with the mass flow rate at the exit. Hub, shroud, blade, and injector surfaces are assumed as no slip adiabatic walls. 50PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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