Details
| Original language | English |
|---|---|
| Pages (from-to) | 38-48 |
| Number of pages | 11 |
| Journal | Technische Mechanik |
| Volume | 43 |
| Issue number | 1 |
| Early online date | 16 Feb 2023 |
| Publication status | Published - 16 Feb 2023 |
Abstract
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.
Keywords
- curved elements, DNS, high-order discretization, ILES, roughness
ASJC Scopus subject areas
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Technische Mechanik, Vol. 43, No. 1, 16.02.2023, p. 38-48.
Research output: Contribution to journal › Article › Research › peer review
}
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 -