CAJ | 학술논문

研究了在渗透系数相差不大的渗流场中椭圆型偏微分方程的系数反问题，通过把CT技术中的Radon变换推广到渗流力学中，给出了渗透系数的计算方法和实例.
연구료재삼투계수상차불대적삼류장중타원형편미분방정적계수반문제，통과파CT기술중적Radon변환추엄도삼류역학중，급출료삼투계수적계산방법화실례.
A finite volume method is presented for the time dependentviscous incompressible flow around an in-line oscillating circular cylinder at Reynolds number of 200、855 and 4000.The N-S equations in finite volume form are solved on a moving grid system, based on a time dependent coordinate transformation.To investigate the vortex-shedding characteristics behind the circular cylinder and the effects of Reynolds number and other non-dimensional parameters such as reduced amplitude and reduced frequency,several numerical schemes have been tested with different amplitudes and frequencies at each Reynolds number.Present numerical results indicate that several types of vortex shedding modes are mainly dependent on the reduced frequency and also the reduced amplitued,which is called synchronization or lock-on.