Resarch on the Key Techniques of CFD in the calculation of rowing blade

摘要

With a rowing blade is simulated, and the wind tunnel test resistance, resistance coefficient, lift, the lift coefficient and the pressure coefficient values are compared. And the influence on flow state of the different attack angles, calculation model is discussed, the calculation domain, the key link of grid, turbulence models, discrete format and so on have great influence on the calculation results. Considering the computer performance and the computational time, the study on the problem of the sub area division grid is the best choice, in to the grid refinement and unstructured grid has a certain advantage in the aspects of using computing core area; in the flow region is not complicated place can consider the appropriate grid density. Angle of attack and the state of different turbulence models on the numerical simulation accuracy of the greatest impact, the flow state is not complicated small angle of attack, the velocity vector diagram of the difference is small, but the velocity contours appear differences in change of position specific reaction speed, the convergence speed of S-A mode SST k-ω model fast; calculation of 40-60 degree angle of attack results is relatively poor, the calculation of RNG k-ε and SST k-ω model is close to the result of calculation. 70-80 degree angle of attack while the calculation of drag coefficient and lift coefficient compared with experiment data is close to the difference; 90 degree angle of attack SST k-ω model is a more ideal model. In the discussion of the computational domain can be chosen as the reference of the contents of the pressure coefficient. Computing grid and computational domain can be turbulent model, according to the above calculation reference fluid mechanics problems in the field of sports.