Effects of adverse and favorable pressure gradients on entropy generation in a transitional boundary layer region under the influence of freestream turbulence

Entropy Generation through a Deterministic Boundary-Layer Structure in Warm Dense Plasma

“…Using the flow environmental parameters from Table 1, the entropy generation rate is computed for warm dense plasma conditions. The resulting value is compared with entropy generation rates in a weak turbulent boundary layer [33,34] for these same input parameters and found to be comparable in value.…”

“…Recent studies (Ghasemi et al [32,33]) have computationally explored the entropy generation in transitional boundary layers subjected to various imposed free stream conditions. In Reference [32], the effect of free-stream turbulence in the production of bypass transition was studied for the resulting generation of entropy within the boundary layer.…”

“…Various computational methods were employed to gain a better understanding of the mechanisms involved in the generation of entropy within the boundary layer flows. Reference [33] reports the results of the study of the effects of favorable and unfavorable pressure gradients imposed on the boundary layer in the generation of entropy within the boundary layer. Again, various computational methods were employed to obtain the extensive results.…”

“…In Reference [33], the imposition of external turbulence induces a "bypass" or early transition to turbulent flow. Experiments have indicated that transition is initiated by a primary instability mechanism in which a fundamental understanding is still lacking, thus hindering our understanding of entropy generation phenomena [33].…”

“…In Reference [33], the imposition of external turbulence induces a "bypass" or early transition to turbulent flow. Experiments have indicated that transition is initiated by a primary instability mechanism in which a fundamental understanding is still lacking, thus hindering our understanding of entropy generation phenomena [33]. The essential objective of the study reported here is to provide additional insight into possible mechanisms leading to the generation of deterministic structures within boundary-layer flows and the mechanisms by which entropy is generated through these structures.…”