scholarly journals EFFECTS OF BOUNDARY CONDITIONS ON SHAPE FACTOR FOR IN-SITU AIR PERMEABILITY MEASUREMENTS

2009 ◽  
Vol 65 (2) ◽  
pp. 579-586
Author(s):  
Shoichiro HAMAMOTO ◽  
Ken KAWAMOTO ◽  
Masanao NAGAMORI ◽  
Toshiko KOMATSU ◽  
Per MOLDRUP
Keyword(s):  
Boundary Conditions ◽  
Shape Factor ◽  
Air Permeability

scholarly journals The Influences of Loop Length and Raw Material on Bursting Strength Air Permeability and Physical Characteristics of Single Jersey Knitted Fabrics

2017 ◽  
Vol 12 (1) ◽  
pp. 155892501701200
Author(s):  
Züleyha Değirmenci ◽  
Ebru Çoruh
Keyword(s):  
Shape Factor ◽  
Strength Properties ◽  
Air Permeability ◽  
Raw Material ◽  
Unit Weight ◽  
Loop Length ◽  
Knitted Fabrics ◽  
Bursting Strength ◽  
Loop Shape ◽  
Single Jersey

This paper reports the effect of loop length and raw material on the air permeability and the bursting strength of plain knitted fabrics. In this study, a series of plain knitted fabrics were produced on a circular knitting machine with cotton, polyester, acrylic and viscose by Ne 30/1 yarns. Each fabric type was produced with four different stitch lengths. All the fabrics were knitted at the same machine setting in order to determine the effect of their structure on the fabric properties. Their geometrical and physical properties were experimentally investigated. The influences of the loop length and the raw material on the number of the courses per cm, number of the wales per cm, loop shape factor, thickness, fabric unit weight, tightness factor, air permeability and bursting strength are analyzed. Statistical analysis indicates that raw material and loop length significantly parameters affect the air permeability and the bursting strength properties of the fabrics.

Experimentally Measured Boundary and Initial Conditions for Simulations

2014 ◽  
Vol 1041 ◽  
pp. 293-296 ◽  
Author(s):  
Dušan Katunský ◽  
Marek Zozulák ◽  
Marián Vertaľ ◽  
Jozef Šimiček
Keyword(s):  
Boundary Conditions ◽  
Indoor Environment ◽  
Initial Conditions ◽  
Weather Data ◽  
Initial Condition ◽  
Dynamic Boundary Conditions ◽  
Climate Monitoring ◽  
Set Up ◽  
Water Profile

Real dynamic boundary conditions and initial condition has to be taken into an account when simulations need to be done. The most helpful are in situ measurement facilities with climate monitoring. Indoor environment operation modes with different air temperature and relative humidity made indoor boundary conditions. Measured weather data are used to create complete boundary conditions for the research locality. Initial condition of masonry water profile is set up. The initial and boundary conditions are considered for an individual locality simulation proposes.

Determination of in-situ elastic properties and reservoir boundary conditions

2020 ◽  
Vol 81 ◽  
pp. 103397
Author(s):  
Saeed Rafieepour ◽  
Silvio Baldino ◽  
Stefan Z. Miska
Keyword(s):  
Boundary Conditions ◽  
Elastic Properties

scholarly journals In situ permeability and shape factor of flat-base recharge wells using variations of porous walls

2020 ◽  
Vol 437 ◽  
pp. 012031
Author(s):  
Azizah Rachmawati ◽  
Suhardjono ◽  
Ussy Andawayanti ◽  
Pitojo Tri Juwono
Keyword(s):  
Shape Factor ◽  
Flat Base ◽  
Porous Walls ◽  
In Situ Permeability

scholarly journals How to build reach-averaged rating curves for remote sensing discharge estimation? The potential of periodic geometry hypotheses

2021 ◽  
Author(s):  
Mounir Mahdade ◽  
Nicolas Le Moine ◽  
Pierre Ribstein
Keyword(s):  
Remote Sensing ◽  
Boundary Conditions ◽  
Water Level ◽  
Hydrological Cycle ◽  
Morphological Variability ◽  
Remote Sensing Data ◽  
Hydraulic Model ◽  
Flow Units ◽  
Rating Curves

<p>River discharge is an essential component in the hydrological cycle. It is used to monitor rivers, the atmosphere, and the ocean through in-situ measurements, acquired on the surface, or from remote sensing to characterize natural disasters such as floods.</p><p>Estimating discharge in ungauged rivers with remote sensing data such as the Surface Water and Ocean Topography (SWOT) mission but without any prior in-situ information is difficult to solve, especially in the case of unknown bathymetry, friction, and lateral river flows. However, the current literature suggests that a better knowledge of bathymetry could considerably facilitate roughness and discharge inferring. SWOT observes water surface elevations, slopes, river widths for several overpasses. We propose an inverse method to estimate discharge in a non-uniform steady-state, maintaining longitudinal (alternating pool-riffle) and lateral (meanders) morphological variability of the river. The idea is to build a rating curve (water level - discharge relationship) at the reach scale using hydraulic signatures (quantities not related to a particular section of the reach, which characterize an aspect of the overall hydraulic behavior: e.g., flooded area as a function of Q, mean water level as a function of Q). The inverse approach requires building a model that produces rating curves that optimally correspond to the hydraulic signatures. It requires a direct hydraulic model and a geometric simplification to facilitate the resolution of the inverse problem.</p><p>The approach is based on the geomorphology of rivers. Indeed, the geometry of natural rivers presents high-frequency variability, characterized by alternating flow units: fast-flowing flow units in rectilinear and shallow areas (riffles), slow-flowing flow units in deeper areas (pools at alternating banks or inner side of meandering bends). This variability generates a variability of the hydraulic variables that covary at the reach scale. However, a simplification into a uniform geometry without spatial variability reappears as a bias in the frictional parameters, thus reducing the inversion's accuracy. For this, we propose a periodic approach that consists of representing the reach equivalent geometry by sinusoidal functions.</p><p>This direct periodic model is used to create a whole periodic geometry (curved based asymmetry sections, Kinoshita curves to model the meander planform) and then solve the Saint-Venant equations in the 2D Basilisk hydraulic model (http://basilisk.fr), which is based on finite volume methods with adaptive grid refinement.</p><p>This model does not require boundary conditions (use of periodic boundary conditions) and provides the ability to model floodplains and thus flood mapping. In the end, there are few parameters to adjust in the model (use of parameters covariances).</p>

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