scholarly journals A discrete scheme of the fluid motion equation based on the pore-scale SPH method

AIP Advances ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 075102
Author(s):  
Gaosheng Yang ◽  
Dengyu Rao ◽  
Guoqing Cai ◽  
Rui Zhou
Keyword(s):  
Fluid Motion ◽  
Motion Equation ◽  
Pore Scale ◽  
Sph Method ◽  
Discrete Scheme

Pore-scale investigation of petro-physical fluid behaviours based on multiphase SPH method

2020 ◽  
Vol 192 ◽  
pp. 107238 ◽  
Author(s):  
Qianhong Yang ◽  
Jun Yao ◽  
Zhaoqin Huang ◽  
Guangpu Zhu ◽  
Lijun Liu ◽  
...  
Keyword(s):  
Pore Scale ◽  
Sph Method

Study on Motion Equation of Acceleration Sensor with Magnetic Fluid

2013 ◽  
Vol 706-708 ◽  
pp. 1034-1037
Author(s):  
Rui Can Hao ◽  
Xin Zhi He ◽  
Wen Gong ◽  
Hua Gang Liu
Keyword(s):  
Magnetic Fluid ◽  
Structural Parameters ◽  
Fluid Motion ◽  
Viscosity Coefficient ◽  
Second Order ◽  
Motion Equation ◽  
Damping Coefficient ◽  
Acceleration Sensor ◽  
Vibration Equation ◽  
Magnetic Viscosity

Acceleration sensor with magnetic fluid is a novel application of buoyancy principle of magnetic fluid. The model of the sensor was established in the paper. To improve the design of the acceleration sensor with magnetic fluid, motion equation of the sensor was deduced, which is the second-order vibration equation. From the equation, the damping coefficient is determined by magnetic viscosity coefficient of the liquid and the sensor structural parameters.

SPH-Based Numerical Modeling of Fluid Flow Interaction with Various Shapes of Breakwater

2019 ◽  
Author(s):  
Rezaldy Naufal Saleh ◽  
Dede Tarwidi ◽  
Jondri
Keyword(s):  
Numerical Modeling ◽  
Fluid Flow ◽  
Coastal Erosion ◽  
Fluid Velocity ◽  
Fluid Motion ◽  
Three Dimensional ◽  
Maximum Velocity ◽  
Sph Method ◽  
Flow Interaction ◽  
Scale Down

Various efforts have been made to prevent coastal erosion. One of the efforts to prevent coastal erosion is to build breakwaters. This paper presents numerical modeling of fluid flow interaction with various shapes of breakwater. Fluid flow impact on different shapes of breakwater, i.e. trapezoidal prism, cylinder, and sphere has been investigated. The three-dimensional numerical modeling is purposed to decisive which breakwaters shape that can reduce the fluid velocity rapidly, compared to other tested breakwaters shapes. In this study, fluid motion is generated by dam break scheme. The fluid motion is governed by momentum and continuity equation. The equations of fluid motion are resolved by smoothed particle hydrodynamics (SPH) method. DualSPHysics, an open-source code based on SPH method, is applied to simulate fluid motion and the interaction with the blocks of breakwater. According to numerical results, the trapezoidal prism shape of breakwater can scale down the fluid velocity faster than the cylinder and sphere shape of breakwater with maximum velocity is about 2.20 m/s. Further, the cylinder shape yields the highest fluid velocity around the breakwater. The trapezoidal prism shape can be used as an effective breakwater.

A CSF-SPH method for simulating drainage and imbibition at pore-scale resolution while tracking interfacial areas

2016 ◽  
Vol 95 ◽  
pp. 212-234 ◽  
Author(s):  
Rakulan Sivanesapillai ◽  
Nadine Falkner ◽  
Alexander Hartmaier ◽  
Holger Steeb
Keyword(s):  
Pore Scale ◽  
Sph Method ◽  
Interfacial Areas

Hydrodynamic Simulation for Intake Valve of Reciprocating Compressor

2013 ◽  
Vol 318 ◽  
pp. 216-219
Author(s):  
Zhang Qin ◽  
Man Lai Zhang ◽  
Zhi Hong Zhou
Keyword(s):  
Fluid Motion ◽  
Motion Equation ◽  
Valve Plate ◽  
Plate Motion ◽  
Intake Valve ◽  
Time Step ◽  
Hydrodynamic Simulation ◽  
Plate Movement ◽  
Calculation Results ◽  
Computational Fluid Dynamics Cfd

The aim of the present paper is to simulate the work process of intake valve in reciprocating compressor.To understand the flow, temperature characters and valve plate movement, the Computational Fluid Dynamics (CFD) is used to simulate the process of expansion and suction. In each time step, the fluid motion equation is iteratively solved to obtain the pressure distribution on the valve plate, and the valve plate moving can been determined by solving the valve plate motion equation at the end of time step. The simulation result shows the pressure and temperature field is uniform in cylinder during compressor expansion, but very different in suction process. The valve plate opens from 53.2° to 219.5°, which is well consistent with the theoretical calculation results (56°, 220°). This study identifies that CFD is a valid tool for exactly investigating the flow and valve plate movement.

scholarly journals Modeling of Water Flows around a Circular Cylinder with the SPH Method

2014 ◽  
Vol 61 (1-2) ◽  
pp. 39-60 ◽  
Author(s):  
Kazimierz Szmidt ◽  
Benedykt Hedzielski
Keyword(s):  
Fluid Flow ◽  
Circular Cylinder ◽  
Fluid Velocity ◽  
Fluid Motion ◽  
Plane Boundary ◽  
Cylinder Surface ◽  
Initial Value ◽  
Sph Method ◽  
First Order ◽  
Time Calculation

Abstract The paper describes the SPH modeling of a plane problem of fluid flow around a rigid circular cylinder. In the model considered, the cylinder is placed in a rectangular fluid domain at a certain distance from a horizontal plane boundary, and it is subjected to fluid flow forces. The fluid motion is induced by a piston type generator. The generator - fluid system starts to move from rest at a certain moment of time. The work aims at a discrete description of the fluid flow around the cylinder and, at the same time, calculation of the pressure distribution along the circumference of the cylinder and the resultant of the pressure on the cylinder. In order to solve the initial value problem considered, a new SPH formulation of boundary conditions on the cylinder surface is proposed which match the physical condition for the fluid velocity at this boundary. For a viscous fluid, an approximate description of the stress tensor is formulated which allows to reduce the differentiation of field functions to the first order in calculating the shear forces in the SPH approach.

Investigation of Wave Characteristics in Oscillatory Motion of Partially Filled Rectangular Tanks

2017 ◽  
Vol 140 (4) ◽  
Author(s):  
M. Ozbulut ◽  
N. Tofighi ◽  
O. Goren ◽  
M. Yildiz
Keyword(s):  
Dynamic Properties ◽  
Fluid Motion ◽  
Oscillatory Motion ◽  
Response Analysis ◽  
Governing Equations ◽  
Sph Method ◽  
Wave Response ◽  
Wide Range ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

Simulations of oscillatory motion in partially filled rectangular tanks with different tank geometries, fullness ratios, and motion frequencies are presented. Smoothed particle hydrodynamics (SPH) method is used to discretize the governing equations together with new velocity variance-based free surface (VFS) and artificial particle displacement (APD) algorithms to enhance the robustness and the accuracy of the numerical scheme. Two-dimensional (2D) oscillatory motion is investigated for three different scenarios where the first one scrutinizes the kinematic characteristics in resonance conditions, the second one covers a wave response analysis in a wide range of enforced motion frequencies, and the last one examines the dynamic properties of the fluid motion in detail. The simulations are carried on for at least 50 periods in the wave response analysis. It is shown that numerical results of the proposed SPH scheme are in match with experimental and numerical findings of the literature.

INFLUENCE OF HEAT TREATMENT OF MOUNTAIN MASSIVE ON TEMPERATURE MODE OF GEOTHERMAL CIRCULATION SYSTEM

2018 ◽  
pp. 44-50
Author(s):  
Yu. P. Morozov
Keyword(s):  
Heat Transfer ◽  
Operating Time ◽  
Fluid Motion ◽  
Coolant Temperature ◽  
Circulation System ◽  
Thermal Processes ◽  
Temperature Mode ◽  
Heat Influx ◽  
Stationary Heat Transfer

Based on the solution of the problem of non-stationary heat transfer during fluid motion in underground permeable layers, dependence was obtained to determine the operating time of the geothermal circulation system in the regime of constant and falling temperatures. It has been established that for a thickness of the layer H <4 m, the influence of heat influxes at = 0.99 and = 0.5 is practically the same, but for a thickness of the layer H> 5 m, the influence of heat inflows depends significantly on temperature. At a thickness of the permeable formation H> 20 m, the heat transfer at = 0.99 has virtually no effect on the thermal processes in the permeable formation, but at = 0.5 the heat influx, depending on the speed of movement, can be from 50 to 90%. Only at H> 50 m, the effect of heat influx significantly decreases and amounts, depending on the filtration rate, from 50 to 10%. The thermal effect of the rock mass with its thickness of more than 10 m, the distance between the discharge circuit and operation, as well as the speed of the coolant have almost no effect on the determination of the operating time of the GCS in constant temperature mode. During operation of the GCS at a dimensionless coolant temperature = 0.5, the velocity of the coolant is significant. With an increase in the speed of the coolant in two times, the error changes by 1.5 times.

Pore-Scale Experimental Study of Boiling in Porous Media

2014 ◽  
Author(s):  
Paul SAPIN ◽  
Paul Duru ◽  
Florian Fichot ◽  
Marc Prat ◽  
Michel Quintard
Keyword(s):  
Experimental Study ◽  
Porous Media ◽  
Pore Scale
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