Transitional separation bubbles and unsteady aspects of aerofoil stall (2008)
A time-accurate solution method for the coupled potential flow and integral boundary-layer equations is used to study aerofoils near stall, where laboratory experiments have shown high-amplitude...
Jones, L.E., Sandberg, R.D., Sandham, N.D.
Direct numerical simulations (DNS) of laminar separation bubbles on a NACA-0012 airfoil at Re-c = 5 x 10(4) and incidence 5 degrees are presented. Initially volume forcing is introduced in order to...
Direct numerical simulations of trailing edge noise generated by boundary-layer instabilities (2007)
Sandberg, R.D., Sandham, N.D., Joseph, P.F.
Direct numerical simulations (DNS) are conducted of noise generated at an infinitely thin trailing edge (TE). The aim is to predict the far-field sound and the near-field hydrodynamics, thereby...
Direct numerical simulations of trailing-edge noise generated by turbulent boundary-layers (2007)
Direct numerical simulations (DNS) are conducted of turbulent flow passing an infinitely thin trailing edge (TE). The objective is to investigate the turbulent flow field in the vicinity of the TE...
Direct numerical simulations of trailing edge noise generated by boundary-layer instabilities (2007)
Sandberg, R.D., Sandham, N.D., Joseph, P.F.
Direct numerical simulations (DNS) are conducted of noise generated at an infinitely thin trailing edge (TE). The aim is to predict the far-field sound and the near-field hydrodynamics, thereby...
The effect of Mach number on unstable disturbances in shock/boundary-layer interactions (2007)
Yao, Y., Krishnan, L., Sandham, N.D., Roberts, G.T.
The effect of Mach number on the growth of unstable disturbances in a boundary layer undergoing a strong interaction with an impinging oblique shock wave is studied by direct numerical simulation and...
Numerical simulation of flow over a rough bed (2007)
Singh, K.M., Sandham, N.D., Williams, J.J.R.
This paper presents results of a direct numerical simulation (DNS) of turbulent flow over the rough bed of an open channel. We consider a hexagonal arrangement of spheres on the channel bed. The...
Strong interaction of a turbulent spot with a shock-induced separation bubble (2007)
Direct numerical simulations have been conducted to study the passage of a turbulent spot through a shock-induced separation bubble. Localized blowing is used to trip the boundary layer well upstream...
Noise due to unsteady flow past trailing edges (2006)
This paper presents two-dimensional direct numerical simulations (DNS) of noise generated at trailing edges (TE) with zero thickness. The simulations are conducted specifying either no-slip or slip...
Nonlinear mechanisms of sound generation in a perturbed parallel jet flow (2006)
Sandham, N.D., Morfey, C.L., Hu, Z.W.
An initial value problem with relevance to jet noise is investigated. A plane parallel jet flow is subjected to a spatially localized initial disturbance and is then left to evolve according to the...
A zonal characteristic boundary condition for simulations of aerodynamic sound (2006)
Sandberg, R.D., Jones, L.E., Sandham, N.D.
This paper presents a non-reflecting boundary condition that significantly reduces the spurious pressure oscillations that are produced when vortical structures in a compressible flow cross the...
Chernyshenko, S.I., Di Cicca, G.M., Iollo, A., Smirnov, A.V., Sandham, N.D., Hu, Z.W.
An artificially synthesized velocity field with known properties is used as a test data set in analyzing and interpreting the turbulent flow velocity fields. The objective nature of this approach is...
The growth and breakdown of localised disturbances into a turbulent spot in a Mach 2 boundary-layer flow have been investigated by direct numerical simulation. In particular, the interaction of a...
Aeroacoustics of wall-bounded turbulent flows (2002)
Hu, Z.W., Morfey, C.L., Sandham, N.D.
Direct numerical simulations of turbulent plane Poiseuille and Couette flow are used to study fluctuating wall pressure and shear stress. For both flows the wave-number–frequency spectra are found...
Yee, H.C., Sjogreen, B., Sandham, N.D., Hadjadj, A.
In a series of papers, Olsson (1994, 1995), Olsson & Oliger (1994), Strand (1994), Gerritsen & Olsson (1996), Yee et al. (1999a,b, 2000) and Sandham & Yee (2000), the issue of nonlinear stability of...
Statistical analysis of the turbulent mixing layer (1999)
Geurts, B.J., Kuerten, J.G.M., Voke, P.R., Kleiser, L., Sandham, N.D.
A numerical investigation of the compressible mixing layer / (1989)
Thesis (Ph. D.)--Stanford University, 1990.