CFD simulations and evaluation of applicability of a wall roughness model applied on a NACA 63 3 ‐418 airfoil

Wind Energy ◽  
2020 ◽  
Vol 23 (11) ◽  
pp. 2056-2067
Author(s):  
Emil Krog Kruse ◽  
Niels Sørensen ◽  
Christian Bak ◽  
Mikkel Schou Nielsen
Keyword(s):  
Wall Roughness ◽  
Cfd Simulations ◽  
Roughness Model

Influence of Ribbon Structure Rough Wall on the Microscale Poiseuille Flow

2005 ◽  
Vol 127 (6) ◽  
pp. 1140-1145 ◽  
Author(s):  
Haoli Wang ◽  
Yuan Wang ◽  
Jiazhong Zhang
Keyword(s):  
Harmonic Functions ◽  
Wave Number ◽  
Fundamental Wave ◽  
Wall Roughness ◽  
Parallel Plates ◽  
Roughness Parameters ◽  
Regular Perturbation ◽  
Roughness Model ◽  
Ribbon Structure ◽  
Flow Resistances

The regular perturbation method is introduced to investigate the influence of two-dimensional roughness on laminar flow in microchannels between two parallel plates. By superimposing a series of harmonic functions with identical dimensional amplitude as well as the same fundamental wave number, the wall roughness functions are obtained and the relative roughness can be determined as the maximal value of the product between the normalized roughness functions and a small parameter. Through modifying the fundamental wave number, the dimensionless roughness spacing is changed. Under this roughness model, the equations with respect to the disturbance stream function are obtained and analyzed numerically. The numerical results show that flowing in microchannels are more complex than that in macrochannels; there exist apparent fluctuations with streamlines and clear vortex structures in microchannels; the flow resistances are about 5–80% higher than the theoretical value under different wall-roughness parameters. Furthermore, analysis shows that the effect of roughness on the flow pattern is distinct from that on the friction factor.

The Dependence of Demolding Characteristics on Side Wall Roughness of Mold in Thermal Imprint

2008 ◽  
Vol 128 (8) ◽  
pp. 325-330 ◽  
Author(s):  
Hiroaki Kawata ◽  
Junya Ishihara ◽  
Masayo Kayama ◽  
Masaaki Yasuda ◽  
Yoshihiko Hirai
Keyword(s):  
Side Wall ◽  
Wall Roughness

Wall Roughness Effects on Combustion Development in Confined Supersonic Flow

2021 ◽  
Vol 37 (1) ◽  
pp. 151-166
Author(s):  
Guillaume Pelletier ◽  
Marc Ferrier ◽  
Axel Vincent-Randonnier ◽  
Vladimir Sabelnikov ◽  
Arnaud Mura
Keyword(s):  
Supersonic Flow ◽  
Wall Roughness ◽  
Roughness Effects
Sign in / Sign up

Export Citation Format

Share Document