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RISS 인기검색어
- 검색키워드
- 저자 : Obula Reddy Kummitha (검색결과 3 건)
- 무료
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Obula Reddy Kummitha,K.M. Pandey 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.1
The shear mixing and streamline vortices are the notable parameters to influence the air–fuel mixing in hypersonic flows. The shock wave development and Mach number significantly influence the shear mixing phenomenon. Hence, this research introduced an unconventional strut and tested its performance for the generation of shock waves at different flow conditions (M = 2,4,6). The Reynolds-averaged Navier–Stokes equations are solved to evaluate the performance of the new strut. Both the DLR scramjet strut injector and wavy wall strut injector are assessed for the shear mixing development. Turbulence for the association of shock waves, mixing layer, and the boundary layer has been modeled with the SST k-ω model. The variation in shock development and its interactions are investigated further with an increase in Mach number. The scramjet flow structure differentiation found the increased number of oblique shock waves with the wavy wall strut fuel injector. It increases the turbulence level with increased streamline vortices, turbulent intensity, and turbulent kinetic energy. The shock wave generation analysis at different Mach numbers (M = 2,4,6) found fewer interactions between the shock wave and shear layer with increased Mach number. From the examination of shock wave generation and its interaction with the shear layer and analysis of turbulent parameters, it is found that the wavy wall strut has an appreciable effect on shock-induced blend augmentation of fuel and air.
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CFD analysis for airflow distribution of a conventional building plan for different wind directions
Obula Reddy Kummitha,R. Vijay Kumar,V. Murali Krishna 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.2
Computational fluid dynamics analysis of a building plan has been investigated with predominant wind velocity for different wind directions. The flow properties’ variation in the computational domain has been modeled by solving the Reynolds-Averaged Navier–Stokes (RANS) equations with the finite volume second-order discretization scheme. The turbulence of airflow distribution in and around the building has been modeled with the Shear Stress Transport (SST) k–ω turbulence model from the analysis of different turbulence models. Numerical results are analysed by evaluating and comparing the various flow properties at different building plan locations with different wind directions. The development of pressure coefficients, wind-driven driving force, and air change per hour are studied for different wind directions. From the analysis of numerical results, it is identified that better ventilation with sufficient airflow distribution has existed when the wind is coming from the west direction.
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Obula Reddy Kummitha,R. Vijay Kumar 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.2
Most of the building energy is mainly contributing to the achievement of thermal comfort. The cooling load on air conditioners will increase with increased heat transfer into the building from the surroundings. The amount of heat transfer into the building mainly depends on building materials used in construction. In this research, an attempt has been made to analyse the self-sufficient homes’ concept by visualizing variation in heat transfer of the building concerning ordinary clay brick and brick with sinicon composition. The temperature distribution of airflow, time lag, decrement factor, and comfort conditions are investigated concerning these materials with computational fluid dynamics. Numerical modeling has been defined by selecting three-dimensional fluid flow governing equations and the k–ε turbulence model. All the fluid flow governing equations have been solved with the finite-volume second-order upwind discretization and SIMPLE algorithm for pressure–velocity coupling. Numerical results have been analysed for both the materials and we identified that the sinicon brick material for the considered wall thickness (9 inches) had registered an increased time lag (∼2 hrs) and a decreased decrement factor (0.05). This research investigation shows that the sinicon-brick wall strongly decreases heat transfer through it compared to the normal-red brick wall. The sinicon brick significantly reduces the air conditioner’s cooling load by decreasing heat energy penetration into the building.
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