relations among Rays, Group Velocity, Phase Velocity, and the Wave Number Vector in Water Waves

In dispersive water waves (e.g., surface gravity waves on deep or shallow water), several concepts describe how waves travel,...

fluid mechanics

EU leaders spring into action as reality of US pivot to Russia hits

‘Next-level urgency’: EU leaders spring into action as reality of US pivot to Russia hits ‘A European/ˌjʊərəˈpiːən/-Russian/ˈ...

News-Reading

two sum

question Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to ta...

Coding

Paper Capillary Gravity wave in different Froude number and different surface tension

paper core

fluid mechanics

Hydronamics note 1

Pressure to the surface to a stream notation \(\varpi\): -> r ///////p439 (22) \(\sigma\): -> \(\omega\) \(c\): -> \...

fluid mechanics

linear and nonlinear waves note 1

wave patterns 📄P411, Sec 12.4 For a point source \(P\), the characteristics carrying disturbances pass through \(P\) and we...

fluid mechanics

Math related

1-dimensional Gaussian integral \[ \begin{gathered} \int_{-\infty}^{\infty} e^{-x^2} d x=\sqrt{\pi} \\ \int_{-\infty}^{\infty...

fluid mechanics

我的小院

原想写一些剖析自我的文字,却不知如何下笔,也罢,就写写最近的杂绪吧。 早春,院子里的不知名的树依然光秃着树干,纹丝不动地点缀着视野里的红墙,肃杀而冷淡。又是一个冬去了,除却偶或光临的故乡的喜鹊,在小院凌乱的大戏台,唱着故园情、天涯愁。素常,小院是安静...

随想
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