植物の中には, ホウセンカに代表されるように鞘がはじけることによって, 種子をばらまいて, 生育範囲を広げるものがある。この, 鞘がはじける現象は, 生長による変形や, 膨潤もしくは乾燥による変形等により鞘に蓄えられたひずみエネルギーが, 短時間で開放されることによって起こるものと考えられる。本研究では, このような植物の種子の鞘がはじける現象に注目し, そのメカニズムについて計算力学的に検討し考察する。

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In orthodontics, by applying a correcting force to the target tooth using a brace, reaction occurs in the periodontal tissue at the root of the tooth and the tooth is moved. A tooth to be moved generates a reaction force around the cone of the tooth and produces stresses, but it is very difficult to know the 3 dimensional actual stress distribution. So, we make a finite element model which consists of a tooth, periodontal membrane and alveolar bone to analyze stress distribution. A canine is selected as a sample tooth to study and various FEM models of different element type are investigated to study the effects of modeling. Results show that a model using a shell element instead of a solid type for a tooth can give a proper result.

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We propose a numerical method for blood flows in the complex vessel. The method is based on the fractional step method, the CIP method, the level set method and the ghost fluid method. We applied the method to blood flows in cerebral artery with five aneurysms.

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