Development of a Specialized Numerical Method for Fluid Motion inRegion with Large Aspect Ratio and Application for Disaster Preparedness

在河流、隧道或管道等大纵横比区域精确计算流体运动而不增加计算成本是不容易的。发展了一种适用于该区域不可压流动计算的新的数值方法。该方法的思想是将原始流量表示为“主流”与主流的变化之和。本文将这种新方法推广到三维有热和热对流流动以及有自由表面流动的计算。

Calculation for fluid motion precisely in regions of very large aspect ratio such as river, tunnel or pipe without much computational costs is not easy. A new numerical method that is suitable for the calculation of incompressible flow in such region is developed. The idea of the method is that the original flow is expressed as sum of the "main flow" and the variation from the main flow. In this study, this new method is extended for the calculations of 3-dimensional flows with heat and thermal convection, and those of the flow with free surface.