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Merge pull request #323 from zhiminzhang0830/cylinder_aistudio
add cylinder2d(transformer-physx) aistudio
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docs/zh/examples/cylinder2d_unsteady_transformer_physx.md

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# 2D-Cylinder(2D Flow Around a Cylinder)
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<a href="https://aistudio.baidu.com/aistudio/projectdetail/6178818?sUid=455441&shared=1&ts=1684397945680" class="md-button md-button--primary" style>AI Studio快速体验</a>
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## 1. 问题简介
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2D Flow Around a Cylinder,中文名称可译作“2维圆柱绕流”,是指二维圆柱低速定常绕流的流型只与 $Re$ 数有关。在 $Re \le 1$ 时,流场中的惯性力与粘性力相比居次要地位,圆柱上下游的流线前后对称,阻力系数近似与 $Re$ 成反比(阻力系数为 10~60),此 $Re$ 数范围的绕流称为斯托克斯区;随着 $Re$ 的增大,圆柱上下游的流线逐渐失去对称性。

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