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• W2183631644 abstract "Turbulent flow in two-dimensional ventilated room has been numerically simulated in the present research. A modified form of Wilcox's two-equation LRN k-ω model is proposed for predicting internal turbulen t ventilation flows. The modifications include adding a turbulent cross-diff usion term in the ω-equation, and re-establishing the closure constants and dampi ng functions, with the application of the wall-function method. The turbul ent cross-diffusion for specific rate, ω, is modeled with two parts: a second-order diffusi on term and a first-order cross-diffusion term. The air was used as the working fluid, and the leng th of ventilation enclosure (9 m), and height of ventilation enclosure (3 m). The study was made for Reynolds number values of (Re=7.5 ×10 3 ). A finite volume method is used with a staggered gri d arrangement. The continuity, momentum and turbulence model equations are solved with hybrid method by using SIMPLE algorithm. A computer program in FORTRAN (90) was developed to carry on the numerical solution. The C omputational algorithm is capable of calculating the hydrodynamic and turbule nce properties such as the velocity, and turbulent kinetic energy, specific di ssipation rate ( ω), turbulent Reynolds stress, and terms of convection, producti on, diffusion, destruction, turbulent cross-diffusion and square root mean of f luctuating velocity. The results showed the peak value of velocity near the wall jet region and negative value of velocity near the bottom region (floor region) i.e. recirculating zone. The maximum value of turbulent kinetic energy near wall jet region in the first horizontal section of ventilation enclosure, and th e profile become flattened in the second section of ventilation enclosure room. The s ame behavior in the turbulent Reynolds stress distribution because depending on v elocity in his calculations. The same behavior between production term and destruction term but the values of production term is positive and the value of destru ction term is negative. The distribution approximately symmetry. The numerical results were compared with other previous theoretical results. The agreement was good, confirming the reliability of the proposed mathematical model and computational algorithm in investigating the performance of turbulence model in numerical simulation of turbulent ventilat ion flows." @default.
• W2183631644 created "2016-06-24" @default.
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• W2183631644 date "2011-01-01" @default.
• W2183631644 modified "2023-09-24" @default.
• W2183631644 title "A Numerical Prediction of the Turbulence Parameters in Two-Dimensional Ventilated Rooms" @default.
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