E-315 土石流の数値シミュレーションと相似則に関する研究 [in Japanese] Numerical Simulation and Similarity of Debris Flow [in Japanese]
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Numerical simulation and hydraulic model test are conducted to evaluate the characteristic of debris flows such as inundation process and the effect of countermeasure facilities. These two methods are based on different principle. Therefore we wonder that they may not give same results. This leads us to consider the similarity of numerical simulation results and Froude similarity of debris flow. We discuss the similarity of a constitutive equation and a governing equation for a debris flow simulation. and examine Froude similarity of typical examples of numerical simulation results in this paper. We found, as results. (1) The Reynolds similarity of the debris flow is explained as same as Froude similarity. (2) When we scale the finite differential distance so as to match the model scale and give the finite differential time according to Froude similarity, Courant Number in a calculation at each step is the same as one in another scale calculation at the same step.
日本流体力学会年会講演論文集 2003, 502-503, 2003