TY - JOUR

T1 - Use of High-Order Curved Elements for Direct and Large Eddy Simulation of Flow over Rough Surfaces

AU - Cengiz, Kenan

AU - Kurth, Sebastian

AU - Wein, Lars

AU - Seume, Joerg R.

N1 - Funding Information: This research did not receive any specific grant from funding agencies in the public, commercial, or non-for-profit sectors. The computational resources were was partially provided by the North-German Supercomputing Alliance (HLRN) and partially by the cluster system team at the Leibniz University of Hannover (LUIS), Germany. We gratefully appreciate the provided resources.

PY - 2023/2/16

Y1 - 2023/2/16

N2 - In the present study, the curved element capabilities of a high-order solver are scrutinized for use in scale-resolving simulations regarding roughness. The approach devised not only suggests a plausible way to adopt a body-fitted grid approach as an alternative to immersed boundary method (IBM), but also enables performing LES instead of DNS without under-resolving the roughness. The method is first tested using various polynomial degrees. Then, it is validated against reference DNS-IBM results from a rough channel flow setup having various Reynolds numbers corresponding to the entire roughness range. The results confirm the validity of the new approach. Finally, a highly loaded low-pressure turbine cascade is simulated under LES resolution with and without the roughness patch. Although a rougher surface is needed for producing a more pronounced impact on the flow, the viability of this method also for pressure-gradient boundary layers is proven.

AB - In the present study, the curved element capabilities of a high-order solver are scrutinized for use in scale-resolving simulations regarding roughness. The approach devised not only suggests a plausible way to adopt a body-fitted grid approach as an alternative to immersed boundary method (IBM), but also enables performing LES instead of DNS without under-resolving the roughness. The method is first tested using various polynomial degrees. Then, it is validated against reference DNS-IBM results from a rough channel flow setup having various Reynolds numbers corresponding to the entire roughness range. The results confirm the validity of the new approach. Finally, a highly loaded low-pressure turbine cascade is simulated under LES resolution with and without the roughness patch. Although a rougher surface is needed for producing a more pronounced impact on the flow, the viability of this method also for pressure-gradient boundary layers is proven.

KW - curved elements

KW - DNS

KW - high-order discretization

KW - ILES

KW - roughness

UR - http://www.scopus.com/inward/record.url?scp=85148657371&partnerID=8YFLogxK

U2 - 10.24352/UB.OVGU-2023-043

DO - 10.24352/UB.OVGU-2023-043

M3 - Article

AN - SCOPUS:85148657371

VL - 43

SP - 38

EP - 48

JO - Technische Mechanik

JF - Technische Mechanik

SN - 0232-3869

IS - 1

ER -