Experimental and numerical investigation into the drag performance of dimpled surfaces in a turbulent boundary layer

Although several previous studies have reported a potential drag-reducing effect of dimpled surfaces in turbulent boundary layers, there is lack replicability across experiments performed by different research groups. To contribute to the dialogue, we scrutinize one most studied dimple geometries literature, which has diameter 20 mm and depth 0.5 mm. There no general consensus literature on drag-reduction performance this particular geometry, with some suggesting drag reduction, while others report increase. The present combined experimental numerical study comprises two sets wind tunnel well-resolved large-eddy simulation. simulation both depict total increase around 1%–2% compared flat reference case. This finding agrees recent Spalart et al. (2019). Furthermore, shed light plausible reason behind discrepancy between (2019) earlier results from van Nesselrooij (2016). Lastly, reveal that pressure main contributor surface. We believe these will new geometry.