摘要
采用交替方向隐格式(ADI)求解三维可压大气中重力波非线性传播的数值模型.经过几个波周期后,重力波波包仍然沿着线性理论射线方向稳定地传播,波包保持着很好的形状,内点和边界保持稳定;水平风与垂直运动的振幅随着传播高度的增加而增加.这说明ADI格式是模拟三维可压大气中重力波传播的一种可靠的格式.模拟结果也表明,在非线性情况下,重力波仍可保持线性传播的某些特征,非线性效应主要表现在对波包传播速度的修正.
By using an Alternative- Direction- Implicit (ADI) scheme, a numerical model for nonlinear propagation of gravity-wave packets in a three-dimensional compressible atmosphere is solved. Results of numerical simulation show that after several periods, the gravity-wave packets propagate steadily upward and keep its shape well. The interior points and boundaries of the calculating region are stable. During the propagation the amplitude of wave-associated perturbation velocities increase with the increasing height. This shows that ADI scheme is reliable for simulating the nonlinear propagation of gravity-wave packets in a three-dimensional compressible atmosphere. From the results, It's also found that under nonlinear condition, a gravity wave packet is still able to keep some characterizations as under linear propagation. The nonlinear effect mainly impacts the propagation velocity of gravity-wave packets.
出处
《空间科学学报》
CAS
CSCD
北大核心
2001年第2期148-158,共11页
Chinese Journal of Space Science
基金
国家自然科学基金重大项目!(49990450)
国家杰出青年基金!(49625407)