Development and implementation of a local algebraic transition model in k-w-SST formulation

Date

2023-8

Author

Okumuş, Bilal

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This study proposes a new correlation-based algebraic transition model using local variables. Instead of solving an additional transport equation for intermittency, the model employs an intermittency function that controls the source terms of the turbulence model used. Thus, the new model solves transition problems using much less computational power compared to one- or two-equation transition models. The intermittency function of the present model is a more sophisticated modified version of that in the SA-BCM transition model, and it is coupled with the k-ω-SST turbulence model to eliminate the shortcomings in the SA-BCM model. The present model is implemented in an in-house CFD solver and calibrated against a series of standard flat plate experiments. An additional airfoil test case is used to calibrate the parameter that provides separation correction. The model is tested with remaining flat plate and airfoil test cases. The validation results show a good agreement with the experiments. It is shown that the new model provides comparable success with more complicated transition models. Therefore, the present model provides an alternative means to include boundary layer transition effects in CFD simulations by reducing the number of constants and functions needed compared to that in other transition models.

Subject Keywords

Laminar-to-turbulent transition, Correlation-based transition model, Turbulence modeling, Algebraic model, Intermittency function

URI

https://hdl.handle.net/11511/105363

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Graduate School of Natural and Applied Sciences, Thesis