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  ______     ___      ______   __   __     _____  
 /_____//   / _ \\   /_____//  \ \\/ //   / ___// 
 `____ `   | / \ ||  `____ `    \ ` //    \___ \\ 
 /___//    | \_/ ||  /___//      | ||     /    // 
 `__ `      \___//   `__ `       |_||    /____//  
 /_//       `---`    /_//        `-`'   `-----`   
 `-`                 `-`

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Text this: Visualization of counter-rotating streamwise vortices in a rectangular channel with one-sided wavy surface