複雑な粗度形状をもつ粗面の粗度評価について(その2:数値計算におけるラフネスパラメータの検討)

Abstract

Evaluation of roughness parameters was performed in order to simulate the turbulent boundary layers over rough, random surfaces such as urban areas.The variation of roughness parameters for the turbulence model against the roughness volume density was examined for staggered arrayed cubic blocks. A number of calculations were carried out to simulate the turbulent boundary layers over various city models using the values of roughness parameters for the cubic blocks. Farely good agreements between numerical results and experimental data shows the applicability of the roughness parameters for staggered arrayed cubic blocks to the urban areas.