Settling velocity of sediments from reservoirs, laboratory measurements and numerical modeling

2016 ◽  
Author(s):  
M Jodeau ◽  
G Antoine ◽  
M Cormier ◽  
Q Monnoyer ◽  
N Gratiot
Keyword(s):  
Numerical Modeling ◽  
Settling Velocity ◽  
Laboratory Measurements

Numerical Modeling of Seabed Response to Combined Wave-Current Loading

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
J.-S. Zhang ◽  
Y. Zhang ◽  
C. Zhang ◽  
D.-S. Jeng
Keyword(s):  
Numerical Modeling ◽  
Stokes Equations ◽  
Navier Stokes ◽  
Laboratory Measurements ◽  
Navier Stokes Equations ◽  
Closure Scheme ◽  
Waves And Currents ◽  
Current Interaction ◽  
Wave Maker ◽  
Current Loading

In this paper, a numerical model is developed to study the dynamic response of a porous seabed to combined wave-current loadings. While the Reynolds-averaged Navier–Stokes equations with k-ε turbulence closure scheme and internal wave-maker function are solved for the phenomenon of wave-current interaction, Biot's poro-elastic “u-p” model is adopted for the seabed response. After validated by the laboratory measurements, this model is applied for the investigation of the effects of waves and currents on the wave-current induced pore pressures. Furthermore, the effects of currents on maximum liquefaction depths of a porous seabed is examined, and it is concluded that the opposite currents will increase the liquefaction depth up to 30% of that without currents.

Numerical modeling and laboratory measurements of seismic attenuation in partially saturated rock

Geophysics ◽  
2014 ◽  
Vol 79 (2) ◽  
pp. L13-L20 ◽  
Author(s):  
Maria Kuteynikova ◽  
Nicola Tisato ◽  
Ralf Jänicke ◽  
Beatriz Quintal
Keyword(s):  
Numerical Modeling ◽  
Seismic Attenuation ◽  
Laboratory Measurements ◽  
Berea Sandstone ◽  
Mesoscopic Scale ◽  
Partially Saturated ◽  
Saturated Rock ◽  
Fluid Saturation ◽  
The Matrix ◽  
Wave Induced

To better understand the effects of fluid saturation on seismic attenuation, we combined numerical modeling in poroelastic media and laboratory measurements of seismic attenuation in partially saturated Berea sandstone samples. Although in laboratory experiments many physical mechanisms for seismic attenuation take place simultaneously, with numerical modeling we separately studied the effect of a single physical mechanism: wave-induced fluid flow on the mesoscopic scale. Using the finite-element method, we solved Biot’s equations of consolidation by performing a quasistatic creep test on a 3D poroelastic model. This model represents a partially saturated rock sample. We obtained the stress-strain relation, from which we calculated frequency-dependent attenuation. In the laboratory, we measured attenuation in extensional mode for dry and partially water-saturated Berea sandstone samples in the frequency range from 0.1 to 100 Hz. All the measurements were performed at room pressure and temperature conditions. From numerical simulations, we found that attenuation varies significantly with fluid distribution within the model. In addition to binary distributions, we used spatially continuous distributions of fluid saturation for the numerical models. Such continuous saturation distribution was implemented using properties of an effective single-phase fluid. By taking into account the matrix anelasticity, we found that wave-induced fluid flow on the mesoscopic scale due to a continuous distribution of fluid saturation can reproduce seismic attenuation data measured in a partially saturated sample. The matrix anelasticity was the attenuation measured in the room-condition dry sample.

scholarly journals Numerical modeling for heatsink emissions in power electronics

2012 ◽  
Vol 10 ◽  
pp. 239-243
Author(s):  
J. Kulanayagam ◽  
J. H. Hagmann ◽  
S. Schenke ◽  
K. F. Hoffmann ◽  
S. Dickmann
Keyword(s):  
Numerical Modeling ◽  
Power Supply ◽  
Heat Sink ◽  
Numerical Models ◽  
Laboratory Measurements ◽  
Radiation Characteristics ◽  
Power Semiconductors ◽  
Noise Current ◽  
Radiated Emissions ◽  
Switching Mode

Abstract. The parasitic coupling between power semiconductors and the heat sink is responsible for noise current in Switching Mode Power Supply (SMPS) systems. In this paper, the variations in the radiation characteristics of heatsinks are investigated with respect to their geometries by use of numerical models. Analyses are facilitated by using a mopole antenna as an EMI receiver and by using simplified heatsink models as EMI transmitters to model the heatsink radiated emissions. In addition, the analysis is confirmed using laboratory measurements.

scholarly journals Minor pressure losses for different connections of PP-R and PEX/Al/PEX installation pipes

2019 ◽  
Vol 100 ◽  
pp. 00045
Author(s):  
Kinga Ligaj ◽  
Marcin K. Widomski ◽  
Anna Musz-Pomorska
Keyword(s):  
Reynolds Number ◽  
Numerical Modeling ◽  
Pressure Loss ◽  
Flow Resistance ◽  
Direct Connection ◽  
Laboratory Measurements ◽  
Local Pressure ◽  
Pressure Losses ◽  
Numerical Research

This paper presents results of laboratory and numerical research concerning determination of water flow resistance through three types of two-way connection of polymer installation pipes: PP-R 20x3.4 mm and PEX/Al/PEX 16x2.0 mm. The following fittings were applied: the direct connection, pipe union and coupler, allowing to test six measurement variants. The laboratory measurements of pressure loss for the tested pipes connections were performed for variable Reynolds number, from approx. 5000 to 50000. The numerical modeling allowing to assess the distributions of velocity of flow and turbulence intensity were performed using FLUENT, Ansys Inc. modelling software. The relations between determined values of minor pressure loss and coefficients of local pressure losses and type of pipes connection, direction of flow as well as the value of Reynolds number were observed. The applied nonparametric statistics, combined with multi comparison, showed that in most cases of analyzed connections, besides the pipe union, the observed differences in pressure losses for various directions of flows are statistically significant for p = 0.05.

Numerical Modeling of Pressure Losses Caused by Bends in Pneumatic Conveying Pipeline

2009 ◽  
Author(s):  
Jie Cui
Keyword(s):  
Numerical Modeling ◽  
Pressure Drop ◽  
Flow Pattern ◽  
Pressure Loss ◽  
Pressure Field ◽  
Pneumatic Conveying ◽  
Laboratory Measurements ◽  
Pressure Losses ◽  
Flow Information ◽  
Parametric Studies

Pneumatic conveying pipelines are widely employed in many industries to transport granular solids. Use of bends with various turning radii in these pipelines is mandatory and it is well known that the bends cause a loss of energy which results in an additional pressure drop. The pressure loss associated with various bends in pneumatic conveying pipelines was studied numerically. The numerical modeling results were validated against laboratory measurements, and parametric studies were performed to examine various factors that affect the pressure loss caused by bends in pneumatic conveying pipelines. Since the numerical results supply flow information at every location in the pipeline, the flow pattern and pressure field of air and pellet were resolved in detail to investigate the mechanism of the pressure loss in such systems.

Sign in / Sign up

Export Citation Format

Share Document