前后排列旋转圆柱体对流热交换的格子Boltzmann方法解

用格子Boltzmann方法，数值研究流过前后排列两旋转圆柱体的二维层流．用二阶精度的速度场和温度场，数值化涉及运动的曲线边界．在Reynolds数为100，Prandtl数为0.71时，研究旋转速度比的变化和不同间距的影响．在4种不同间距(3, 1.5, 0.7, 0.2)下，研究旋转速度比的不同范围．结果表明，当间距取大数值时，第1个圆柱体的升力和阻力系数，与单个圆柱体相类似；对所有间距(除间距3以外)，第2个圆柱体的升力系数，随着角速度的增加而减小，而阻力系数反而增加．圆柱体表面平均周期Nusselt数的结果表明，当两圆柱体间距小且角速度又低时，热传导是主要的传热机理，而当间距大且角速度又高时，对流是主要的传热机理．

Convective Heat Transfer From Two Rotating Circular Cylinders in Tandem Arrangement Using Lattice Boltzmann Method

A numerical investigation of the two-dimensional laminar flow past two rotating circular cylinders in tandem arrangement using lattice Boltzmann method was conducted.The numerical strategy for dealing with curved and moving boundaries of second-order accuracy for velocity and temperature fields was used.The effects of variation of rotational speed ratio and different gap spacing were studied at Reynolds number of 100 and Prandtl number of 0.71.A various range of rotational speed ratio for four different gap spacing of 3,1.5,0.7 and 0.2 were investigated.Results show that,for the first cylinder lift and drag coefficients for large amounts of gap spacing are similar a single cylinder while for the second cylinder lift coefficient with increasing angular velocity for all gap spacing is descending but drag coefficient is ascending with the exception of gap spacing of 3.Results of the averaged periodic Nusselt number on the surface of cylinders show that for small distance between cylinders and low angular velocity,conduction is dominant mechanism of heat transfer but for large distance and high angular velocity convection is main mechanism of heat transfer.