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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