Numerical simulation of non-reacting turbulent flows over a constant temperature solid surface in regression

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2007

Author

Karaeren, Cenker

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In this study, an attempt is made to obtain convergent and stable solutions of the K-E turbulence model equations for non-reacting turbulent flows over an isothermal solid surface in regression. A physics based mathematical model is used to describe the flow and temperature field over the moving surface. The flow is assumed to be two-dimensional, unsteady, incompressible with boundary layer approximations. Parabolized form of the standard K-E equations is adopted to simulate turbulence in the flow. Regression of the solid surface causes the bounds of the solution domain to change with time, therefore a coordinate transformation is used in the vertical direction. The computational domain with fixed boundaries is discretized using an orthogonal grid system where a coordinate stretching is used in the vertical direction. A second order accurate, explicit finite difference technique is used for discretization of the governing equations. The final set of discretized equations is then solved using a solution algorithm specifically developed for this study. The verification of the solution algorithm includes a grid independence study, time increment study, and a comparison of the steady state results for the laminar and the turbulent flow cases. Finally, a parametric study is conducted using the proposed solution algorithm to test the stability of the numerical results for different Reynolds numbers, regression rates, and surface temperatures. It is concluded that the proposed numerical solution algorithm is capable of providing convergent and stable solutions of the two-equation turbulence model.

Subject Keywords

Mechanical engineering., Turbulence.

URI

http://etd.lib.metu.edu.tr/upload/12609111/index.pdf
https://hdl.handle.net/11511/17371

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

C. Karaeren, “Numerical simulation of non-reacting turbulent flows over a constant temperature solid surface in regression,” M.S. - Master of Science, Middle East Technical University, 2007.