Correlations between the properties of a rough surface and their associated drag are very useful tool in engineering. Here, we assess effect different scales roughness by numerically simulating flow over surfaces constructed band-passing spectral content scanned grit-blasted surface. Although velocity fluctuations found overall to be resilient changes, find existing correlations only qualitativ...

Abstract Surface roughness plays a critical role and has effects in, e.g. fluid dynamics or contact mechanics. For example, to evaluate behavior at different properties, real-world numerical experiments are performed. Numerical simulations of rough surfaces can speed up these studies because they help collect more relevant information. However, it is hard simulate with deterministic structured ...

In this work, the adhesion of biomimetic polydimethylsiloxane (PDMS) pillar arrays with mushroom-shaped tips was studied on nano- and micro-rough surfaces and compared to unpatterned controls. The adhesion strength on nano-rough surfaces invariably decreased with increasing roughness, but pillar arrays retained higher adhesion strengths than unpatterned controls in all cases. The results were a...