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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