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Computational fluid dynamics

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Full-Text Articles in Mechanical Engineering

Numerical Simulations Of Mhd Fluid Flow And Heat Transfer In A Lid-Driven Cavity At High Hartmann Numbers, Diplin Kalapurakal, Abhilash Chandy Apr 2015

Numerical Simulations Of Mhd Fluid Flow And Heat Transfer In A Lid-Driven Cavity At High Hartmann Numbers, Diplin Kalapurakal, Abhilash Chandy

Dr. Abhilash J. Chandy

Numerical calculations of the 2D steady incompressible magnetohydrodynamic (MHD) driven cavity flow and heat transfer are presented. The Navier−Stokes equations in the stream function and vorticity formulation, and the energy equation are solved numerically using a uniform mesh of size 601 × 601. The effect of magnetic field in terms of the Hartmann number (Ha ≤ 1000) are studied for steady incompressible driven cavity flow for various Prandtl numbers (0.001 < Pr < 10). Contours of stream function, vorticity, and temperature, and profiles of centerline velocities and Nusselt number (Nu) at the hot boundary are presented to assess the MHD effects. While ...


Towards Fft-Based Direct Numerical Simulations Of Turbulent Flows On A Gpu, Catherine Rucki, Abhilash Chandy Apr 2015

Towards Fft-Based Direct Numerical Simulations Of Turbulent Flows On A Gpu, Catherine Rucki, Abhilash Chandy

Dr. Abhilash J. Chandy

The accurate simulation of turbulence and the implementation of corresponding turbulence models are both critical to the understanding of the complex physics behind turbulent flows in a variety of science and engineering applications. Despite the tremendous increase in the computing power of central processing units (CPUs), direct numerical simulation of highly turbulent flows is still not feasible due to the need for resolving the smallest length scale, and today's CPUs cannot keep pace with demand. The recent development of graphics processing units (GPU) has led to the general improvement in the performance of various algorithms. This study investigates the ...


Aerodynamics Inside A Rapid Compression Machine, Gaurav Mittal, Chih-Jen Sung Apr 2015

Aerodynamics Inside A Rapid Compression Machine, Gaurav Mittal, Chih-Jen Sung

Dr. Gaurav Mittal

The aerodynamics inside a rapid compression machine after the end of compression is investigated using planar laser-induced fluorescence (PLIF) of acetone. To study the effect of reaction chamber configuration on the resulting aerodynamics and temperature field, experiments are conducted and compared using a creviced piston and a flat piston under varying conditions. Results show that the flat piston design leads to significant mixing of the cold vortex with the hot core region, which causes alternate hot and cold regions inside the combustion chamber. At higher pressures, the effect of the vortex is reduced. The creviced piston head configuration is demonstrated ...


Vortex Formation In A Rapid Compression Machine: Influence Of Physical And Operating Parameters, Gaurav Mittal, Mandhapati Raju, Chih-Jen Sung Apr 2015

Vortex Formation In A Rapid Compression Machine: Influence Of Physical And Operating Parameters, Gaurav Mittal, Mandhapati Raju, Chih-Jen Sung

Dr. Gaurav Mittal

The performance of a rapid compression machine (RCM) with a creviced piston is assessed over a range of operating conditions through computational fluid dynamics simulations with systematic demonstration of the effects of compressed gas pressure, temperature, stroke length, and clearance on altering vortex formation and temperature homogeneity inside the reaction chamber. Simulated results show that as compressed gas pressure is reduced, the temperature homogeneity deteriorates due to the combined effect of thicker boundary layer and increased flow velocities. A further optimization of the creviced piston geometry is then required to completely suppress the roll-up vortex. Stroke length and clearance volume ...