Zobrazeno 1 - 10
of 147
pro vyhledávání: '"Kawahara, Genta"'
In order to obtain insights into dynamics of developed plane Couette turbulence, this paper considers bifurcation structure of unstable periodic orbits (UPOs) in the large-eddy-simulation (LES) system with the Smagorinsky-type eddy viscosity model. T
Externí odkaz:
http://arxiv.org/abs/2107.14407
Publikováno v:
J. Fluid Mech. 931 (2022) R3
Direct numerical simulations have been performed for heat and momentum transfer in internally heated turbulent shear flow with constant bulk mean velocity and temperature, $u_{b}$ and $\theta_{b}$, between parallel, isothermal, no-slip and permeable
Externí odkaz:
http://arxiv.org/abs/2106.07844
Direct numerical simulations have been performed for turbulent thermal convection between horizontal no-slip, permeable walls with a distance $H$ and a constant temperature difference $\Delta T$ at the Rayleigh number $Ra=3\times10^{3}-10^{10}$. On t
Externí odkaz:
http://arxiv.org/abs/2004.08831
We have found a multi-scale steady solution of the Boussinesq equations for Rayleigh-B\'enard convection in a three-dimensional periodic domain between horizontal plates with a constant temperature difference by using a homotopy from the wall-to-wall
Externí odkaz:
http://arxiv.org/abs/2004.06868
Publikováno v:
Phys. Rev. Fluids 5, 034305 (2020)
This work employs for the first time invariant solutions of the Navier-Stokes equations to study the interaction between finite-size particles and near-wall coherent structures. We consider horizontal plane Couette flow and focus on Nagata's upper-br
Externí odkaz:
http://arxiv.org/abs/2002.04361
Publikováno v:
Phys. Rev. Lett. 123, 134502 (2019)
We present an unstable periodic orbit in large eddy simulation of an incompressible fluid in a periodic box subject to a constant body force. The width of the inertial range of spatial scales, on which this simulation models high-Reynolds-number turb
Externí odkaz:
http://arxiv.org/abs/1809.08649
Publikováno v:
Fluid Dynamics Research 38(1), 19-46, 2006
Temporally periodic solutions are extracted numerically from forced box turbulence with high symmetry. Since they are unstable to small perturbations, they are not found by forward integration but can be captured by Newton-Raphson iterations. Several
Externí odkaz:
http://arxiv.org/abs/1804.00547
Autor:
Shimizu, Masaki, Kawahara, Genta
In a dissipative system, there exists the (global) attractor which has finite fractal dimensions. The flow on the attractor can be parametrized by a finite number of parameters (Temmam 1987). Using machine learning we demonstrate how to construct pre
Externí odkaz:
http://arxiv.org/abs/1803.08206
We describe and compare two time-periodic flows embedded in Large Eddy Simulation (LES) of turbulence in a three-dimensional, periodic domain subject to constant external forcing. One of these flows models the regeneration of large-scale structures t
Externí odkaz:
http://arxiv.org/abs/1802.00845
The divergence-free time-independent velocity vector field has been determined so as to maximise heat transfer between two parallel plates of a constant temperature difference under the constraint of fixed total enstrophy. The present variational pro
Externí odkaz:
http://arxiv.org/abs/1801.04588