“Phase diagram” for viscoelastic Poiseuille flow over a wavy surface
نویسندگان
چکیده
منابع مشابه
Shape diagram of vesicles in Poiseuille flow.
Soft bodies flowing in a channel often exhibit parachutelike shapes usually attributed to an increase of hydrodynamic constraint (viscous stress and/or confinement). We show that the presence of a fluid membrane leads to the reverse phenomenon and build a phase diagram of shapes-which are classified as bullet, croissant, and parachute-in channels of varying aspect ratio. Unexpectedly, shapes ar...
متن کاملExistence of Turning Points for the Response Diagram of the Poiseuille Flow with Prescribed Flow-rate
We study the stationary Poiseuille flow in a cylindrical channel of arbitrary cross-section with temperature dependent viscosity and internal dissipation. We assume the flow-rate Φ given and the axial pressure gradient μ unknown. This leads to a nonlocal problem. We show the existence in the response diagram, the plane (Φ, μ), of two turning points. 1. In this paper we study the stationary Pois...
متن کاملParticle distributions in the flow over a wavy wall
In this paper we will present the results of direct numerical simulation (DNS) of the flow over a small amplitude wavy wall. The evolution in space and time of particles are released in this flow will be examined. It will be shown that small waves on the channel bottom can generate large longitudinal vortices similar to Langmuir vortices that are observed in flows with waves at the free-surface...
متن کاملNumerical Modelling of Flow Over A Rigid Wavy Surface by LES
A flow field over a rigid wavy surface is numerically generated. The general concept of the large eddy simulation that captures the large scale flow structure is utilized. A coordinate transformation scheme is developed to transform any wavy surface to a flat surface. The numerical computations are carried out in the co ~ domain. The subgrid scales are resolved by utilizing a Smagorinsky subgri...
متن کاملDirect Numerical Simulation (dns) of Turbulent Flow over Wavy Surfaces
Abstract. The present study adresses the turbulent flow over a wavy surface by direct numerical simulation (DNS). Compared to classical channel flow the wavy surface structure adds a degree of complexity to the flow by inducing streamline curvature, flow separation and flow reattachment, thus leading to flow situations which are often present in relevant technical and geophysical applications. ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics of Fluids
سال: 2018
ISSN: 1070-6631,1089-7666
DOI: 10.1063/1.5057392