The Reynolds equation defines the lubrication flow between smooth contacting parts. However, it is questionable that can accurately anticipate pressure behavior involving undeformed solid asperity interactions occur under severe operating conditions. Perhaps, mathematical model inaccurate and incomplete, or some HL (hydrodynamic lubrication) EHL (elastohydrodynamic assumptions are invalid in mi...

The objective of this study is to design a hull-mounted sonar dome ship using OpenFOAM with bulbous bow effect at cruise speed in calm water. Verification and validation for the original simulation are conducted. Next, 1.44 million grid size selected different lengths. By protruding forward 7.5% ship’s length, optimal 17% resistance reduction achieved mainly caused by pressure decrease. not onl...

In this work, the results of mixing study by a jet mixer in a tank have been investigated in the laboratory scale. The tank dimensions are and the jet entrance have been considered in the center of upper surface of tank. RNG-k-ε model is used as the turbulent model for the prediction of the pattern of turbulent flow inside the tank. For this purpose, a tank with volume of 110 liter is simulated...

In this study an attempt has been made to study the hydrodynamic performance of pumpjet propulsor. Numerical investigation based on the Reynolds Averaged NavierStokes (RANS) computational fluid dynamics (CFD) method using structured grid, SST kω turbulence model has been carried out. The grid independence inspection is applied to verify accuracy of numerical simulation. The numerical prediction...

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A multi-pulse injection strategy for premixed charge compression ignition (PCCI) combustion was investigated in a four-valve, direct-injection diesel engine by a computational fluid dynamics (CFD) simulation using KIVA-3V code coupled with detailed chemistry. The effects of fuel splitting proportion, injection timing, spray angles, and injection velocity were examined. The mixing process and fo...

A numerical and experimental investigation of flow and heat transfer in a gas- liquid Thermosyphon Heat Exchanger "THE" with built in heat pipes and aluminum plate fins for moderate Reynolds numbers has been carried out. It's module is composed of 6 rows and 15 columns copper pipes with aluminum plate fins with dimensions of 130cm height, 47cm width and  20cm depth. The tubes have been fill...