COMPARISON OF INERTIAL AND NONINERTIAL REFERENCE FRAME SOLUTIONS OF NAVIER STOKES EQUATIONS FOR TURBO-MACHINERY FLOW

Date

2023-02-28

Author

Eşdur, Merve

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CFD has been the most important tool for the design of turbo-machinery. The complexity of the flow through such designs requires small time scales and length-scales. Such flow fields are unsteady in nature, however unsteady anaylsis require enormous computer time and not always feasible for practical applications. The key simplification for the analysis is the steady-state assumption of the flow field with respect to the rotating frame of reference. The most efficient machines now are designed by the steady flow assumption. In this work, the 3D, Reynolds- averaged thin-layer Navier Stokes solver CFL3D has been tested for flows through turbo-machinery by both inertial and non-inertial frame of reference. Non-inertial frame of reference rotates as the blades and allows to run a steady simulation while inertial frame of reference requires the grid to be rotated and unsteady analysis has to be run. Dual time stepping is used for unsteady simulations for the convergence acceleration. The code is tested by NASA's Rotor67, first stage of a two staged fan. Results are compared with each other and validated by the experimental results. The performance of both analysis is demonstrated by the comparison of the computer time required for both. Implementation opf noninertial reference frame and boundary conditions are disscussed. It was shown that source terms have a huge effect at the boundaries.

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https://hdl.handle.net/11511/107422

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Department of Aerospace Engineering, Conference / Seminar