Stably stratified airflow over a waved water surface. Part 1: Stationary turbulence regime

2015 ◽  
Vol 142 (695) ◽  
pp. 759-772 ◽  
Author(s):  
O. A. Druzhinin ◽  
Y. I. Troitskaya ◽  
S. S. Zilitinkevich
Keyword(s):  
Water Surface ◽  
Surface Part ◽  
Stationary Turbulence ◽  
Turbulence Regime

Prediction of Hydrodynamic Performance of 3-D WIG by IBEM

2018 ◽  
Vol Vol 160 (A3) ◽  
Author(s):  
S Bal
Keyword(s):  
Free Surface ◽  
Water Surface ◽  
Three Dimensional ◽  
Free Water ◽  
Hydrodynamic Performance ◽  
Ground Vehicle ◽  
Surface Part ◽  
Free Water Surface ◽  
Constant Strength ◽  
Lift And Drag

The hydrodynamic performance of three-dimensional WIG (Wing-In-Ground) vehicle moving with a constant speed above free water surface has been predicted by an Iterative Boundary Element Method (IBEM). IBEM originally developed for 3-D hydrofoils moving under free surface has been modified and extended to 3-D WIGs moving above free water surface. The integral equation based on Green's theorem can be divided into two parts: (1) the wing part, (2) free surface part. These two problems are solved separately, with the effects of one on the other being accounted for in an iterative manner. Both the wing part including the wake surface and the free surface part have been modelled with constant strength dipole and source panels. The effects of Froude number, the height of the hydrofoil from free surface, the sweep, dihedral and anhedral angles on the lift and drag coefficients are discussed for swept and V-type WIGs.

Stably stratified air-flow over a waved water surface. Part 2: Wave-induced pre-turbulent motions

2015 ◽  
Vol 142 (695) ◽  
pp. 773-780 ◽  
Author(s):  
O. A. Druzhinin ◽  
Y. I. Troitskaya ◽  
S. S. Zilitinkevich
Keyword(s):  
Water Surface ◽  
Air Flow ◽  
Surface Part ◽  
Wave Induced

PREDICTION OF HYDRODYNAMIC PERFORMANCE OF 3-D WIG BY IBEM

2021 ◽  
Vol 160 (A3) ◽  
Author(s):  
S Bal
Keyword(s):  
Free Surface ◽  
Water Surface ◽  
Three Dimensional ◽  
Free Water ◽  
Hydrodynamic Performance ◽  
Ground Vehicle ◽  
Surface Part ◽  
Free Water Surface ◽  
Constant Strength ◽  
Lift And Drag

The hydrodynamic performance of three-dimensional WIG (Wing-In-Ground) vehicle moving with a constant speed above free water surface has been predicted by an Iterative Boundary Element Method (IBEM). IBEM originally developed for 3-D hydrofoils moving under free surface has been modified and extended to 3-D WIGs moving above free water surface. The integral equation based on Green's theorem can be divided into two parts: (1) the wing part, (2) free surface part. These two problems are solved separately, with the effects of one on the other being accounted for in an iterative manner. Both the wing part including the wake surface and the free surface part have been modelled with constant strength dipole and source panels. The effects of Froude number, the height of the hydrofoil from free surface, the sweep, dihedral and anhedral angles on the lift and drag coefficients are discussed for swept and V-type WIGs.

Immunoferritin localization of intracellular antigens in positively stained frozen sections

1978 ◽  
Vol 36 (2) ◽  
pp. 168-169
Author(s):  
K. T. Tokuyasu
Keyword(s):  
Surface Tension ◽  
Water Surface ◽  
Thin Layers ◽  
The Other ◽  
Positive Staining ◽  
Frozen Sections ◽  
The Past ◽  
Ultrathin Frozen Sections ◽  
Definition Of

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).

Effect of mesh on CFD aerodynamic performances of a container ship

2020 ◽  
Vol 20 (3) ◽  
pp. 343-353
Author(s):  
Ngo Van He ◽  
Le Thi Thai
Keyword(s):  
Water Surface ◽  
Reference Model ◽  
Full Scale ◽  
Scale Model ◽  
Container Ship ◽  
Ansys Fluent ◽  
Remarkable Effect ◽  
Aerodynamic Performances ◽  
Mesh Convergence

In this paper, a commercial CFD code, ANSYS-Fluent has been used to investigate the effect of mesh number generated in the computed domain on the CFD aerodynamic performances of a container ship. A full-scale model of the 1200TEU container ship has been chosen as a reference model in the computation. Five different mesh numbers for the same dimension domain have been used and the CFD aerodynamic performances of the above water surface hull of the ship have been shown. The obtained CFD results show a remarkable effect of mesh number on aerodynamic performances of the ship and the mesh convergence has been found. The study is an evidence to prove that the mesh number has affected the CFD results in general and the accuracy of the CFD aerodynamic performances in particular.

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