A125 砂丘の移動計算のモデル依存性

概要

論文の詳細を見る
In arid lands, it is often obserbed that the barchan sand dune of crescent-shape is moved by the wind over a long distance without changing its shape. It is very important to make clear the mechanizm of the sand movement and to estimate the amount of such movement. One approach to study these phenomena by the numerical simulation is to calculate the flow field over the sand dune, to estimate the mass of the sand transfer through the friction of the wind and to determine the new shape of the sand dune. In this approach, the relation between the friction and the sand transfer becomes key point. In this study, we use the formula proposed by Bagnold, Kawamura and Lettau and compare the results. It is found that the speed of the movement is greatly affected by the models (the fastest one is almost twice as large as the slowest one) although each model gives crescent-shape dune.
日本流体力学会の論文
2000-07-25