Big size particles had serious collision with wall of convergent region, and the region without particles was larger.

颗粒越大与收缩段壁面碰撞越剧烈，无粒子区越大。

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With the particle collision taken into account, the interaction of plasma with a fixed wall is studied by using a two-fluid model.

在考虑粒子碰撞的情况下，利用二流体模型研究了等离子体与器壁之间的相互作用。

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He was hurt in a hard collision with the outfield wall a week earlier at Dodger Stadium that also caused him to need 11 stitches on his chin.

NPR: Giants' Vogelsong Wins At Last But Injures Hand

Hamlin was airlifted from the track after a collision with Joey Logano on the penultimate turn sent him nearly head-on into the inside wall.

NPR: Hamlin Has Compression Fracture In Lower Back