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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