Abstract
Abstract
Highlights
Flows over curved surfaces, involving unsteady separation and reattachment in space and time, occur in numerous engineering applications, such as engine nacelles, curved ducts, bluff bodies and so on
Chung & Pullin (2009) proposed the virtual wall model, which dynamically couples the outer resolved region with the inner wall region, and offers a slip velocity boundary condition for the filtered velocity field on the ‘virtual’ wall. This wall model has been successfully deployed in canonical flows without separation (Inoue & Pullin 2011; Saito, Pullin & Inoue 2012), and extended by Cheng, Pullin & Samtaney (2015) to simulate flat-plate turbulent boundary layer flows with separation and reattachment
We have presented results from LES of turbulent flow in a channel constricted by streamwise periodically distributed hills at Reh = 10 595, 33 000 and 105
Summary
Flows over curved surfaces, involving unsteady separation and reattachment in space and time, occur in numerous engineering applications, such as engine nacelles, curved ducts, bluff bodies and so on. Chung & Pullin (2009) proposed the virtual wall model, which dynamically couples the outer resolved region with the inner wall region, and offers a slip velocity boundary condition for the filtered velocity field on the ‘virtual’ wall This wall model has been successfully deployed in canonical flows without separation (Inoue & Pullin 2011; Saito, Pullin & Inoue 2012), and extended by Cheng, Pullin & Samtaney (2015) to simulate flat-plate turbulent boundary layer flows with separation and reattachment. This virtual wall model was extended to generalized curvilinear coordinates by Gao et al (2019) and utilized in WMLES for flow past airfoils. We include the details of the wall model, the SGS model and the numerical methods in appendices for the sake of completeness
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