Two-phase load distribution for rendering large 3D models on a graphics cluster

2009 ◽  
Author(s):  
Alexandre Beaudoin ◽  
Dhrubajyoti Goswami ◽  
Sudhir Mudur
Keyword(s):  
Load Distribution ◽  
3D Models ◽  
Two Phase

scholarly journals Analysis of the Possibility of Using the Plain CFD Model to Simulate Two-Phase Flows in Spatial Systems of Pressure Sewer Networks

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1779
Author(s):  
Piotr Siwicki ◽  
Marcin Krukowski ◽  
Jan Studziński ◽  
Bartosz Szeląg ◽  
Rafał Wojciechowski
Keyword(s):  
Fluid Model ◽  
3D Models ◽  
Sewer System ◽  
Two Phase ◽  
Significant Deterioration ◽  
Laboratory Installation ◽  
Sewer Systems ◽  
Spatial Systems ◽  
Volume Of Fluid Model ◽  
Cfd Method

The paper analyzes the possibility of using the CFD (Computational Fluid Dynamics) method to predict the amount of sewage remaining in siphons after a full air blast of the pressure sewer system. For this purpose, the results from measurements carried out on a laboratory installation were compared with the results obtained from modelling using a spatial model (3D) and a plain model (2D) of the installation. To determine these models, the structure of the VOF (Volume of Fluid) model was used in the CFD method. The simulation calculations carried out make it possible to state that the use of the plain model with the development of the installation modelled in the plan does not result in significant deterioration of the obtained results. The possibility of using 2D models for modelling pumped sewer systems allows for a significant shortening of the calculation time, which, in practice, results in the possibility of modelling much larger and longer installations than is possible with 3D models.

Research on Improving Cavitation Performance of High Temperature Vacuum Tower Bottom Pump

2010 ◽  
Author(s):  
Xiao-yan Ye ◽  
Ya-na Ding ◽  
Jun-hui Zhang ◽  
Ming-ke Huang ◽  
Bing-hui Pan
Keyword(s):  
3D Models ◽  
Hydraulic Model ◽  
Working Environment ◽  
Vacuum Tower ◽  
Two Phase ◽  
Motion Patterns ◽  
Cavitation Performance ◽  
Processing Module ◽  
Simulation Results ◽  
Icem Cfd

In petrochemical industry the working environment of vacuum tower bottom pump is harsh and its cavitation requirement is high. In view of this problem, we optimally designed two kinds of impeller. With well designed suction chamber and volute, two groups of hydraulic model were assembled. The 3d models were made in PROE; the flow field was meshed in the pre-processing module ICEM-CFD of CFX; then CFX was used to calculate flows under three discharges in two phase motion patterns of the two hydraulic models, and also cavitation was predicted. The simulation results show that the first hydraulic model is better than the second, so the first hydraulic model was made into full mold and also test was done. The simulation results and test results are contrasted: at Q = 406m3/h, the predicted critical NPSH is 3.74m, while the test critical NPSH is 4.02m, which meet the design commands and the deviation is not large. This shows that CFD technology is helpful on performance prediction in engineering. This research provides a theoretical guidance for study on improving cavitation performance of vacuum tower bottom pump.

scholarly journals Numerical Analysis of Stratified and Slug Flows

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Saliha Nouri ◽  
Zouhaier Hafsia ◽  
Salah Mahmoud Boulaaras ◽  
Ali Allahem ◽  
Salem Alkhalaf ◽  
...  
Keyword(s):  
Axial Velocity ◽  
Volume Fraction ◽  
Stratified Flow ◽  
3D Models ◽  
Water Volume ◽  
Volume Distribution ◽  
Two Phase ◽  
Slug Flows ◽  
2D And 3D ◽  
2D Model

The main purpose of this study is to compare two-dimensional (2D) and three-dimensional (3D) two-phase models for both stratified and slug flows. These two flow regimes interest mainly the petroleum and chemical industries. The volume of fluid (VOF) approach is used to predict the interface between the two-phase flows. The stratified turbulent flow corresponds to the oil-water phases through a cylindrical pipe. To simulate the turbulent stratified flow, the k − ω turbulence model is used. The slug laminar flow concerns the kerosene-water phases through a rectangular microchannel. The simulated results are validated using the previous experimental results available in the literature. For the stratified flow, the axial velocity and the water volume fraction profiles obtained by 2D and 3D models approximate the measurement profiles at the same test section. Also, the T-junction in a 2D model affects only the inlet vicinity. For downstream, the 2D and 3D models lead to the same axial velocity and water volume distribution. For the slug flow, the simulated results show that the 3D model predicts the thin film wall contrary to the 2D model. Moreover, the 2D model underestimates the slug length.

Static analysis of high-rise concrete buildings with Holistic 3D models

2021 ◽  
Author(s):  
Thomas Markus Laggner ◽  
Dirk Schlicke ◽  
Nguyen Viet Tue
Keyword(s):  
Load Distribution ◽  
3D Models ◽  
Systematic Investigation ◽  
Linear Elastic ◽  
High Rise ◽  
Flat Slabs ◽  
The Difference ◽  
Stage Analysis ◽  
Creep And Shrinkage ◽  
Modelling Approaches

<p>Holistic 3D calculation models have become an indispensable part of the structural analysis of complex and/or unconventional structures. The determined load distribution within the structure and the particular stressing of the members are hereby strongly depending on the modelling approaches. This contribution shows the effects of different modelling approaches by a systematic investigation of a representative high-rise reinforced concrete building with flat slabs and a core for the structural stability. In principal, the difference between the conventional method using extracted 2D sub models and a linear-elastic holistic 3D model is shown. Following, the effect of the regarded connection stiffness between the structural elements, the significance of a construction stage analysis (CSA) and the influences of creep and shrinkage of the concrete on the load distribution are presented in detail. It was found that all parameters as well as their interplay have clear influences on the determined stressing and should be addressed accordingly.</p>

scholarly journals An Efficient Model for Predicting the Segregation Profile of Binary Fluidized Beds

2018 ◽  
Vol 63 (1) ◽  
pp. 147-159
Author(s):  
Mohamed Sobhi Al-Agha ◽  
Pál Szentannai
Keyword(s):  
Concentration Profile ◽  
Fluidized Beds ◽  
Vertical Axis ◽  
3D Models ◽  
Data Sets ◽  
Two Phase ◽  
Main Work ◽  
Fitting Procedure ◽  
Segregation Profile ◽  
Vertical Concentration Profile

In most cases, the stationary fluidized beds are composed of two different particle classes (inert and active particles), and the concentration profile of these binary beds along the vertical axis is crucial regarding the effectiveness of the reactor. The present study introduces a semi-empirical 1D mathematical model for predicting the vertical concentration profile of binary fluidized beds. The proposed model is a developed and applicable version of the so-called Gibilaro and Rowe two-phase model, in which the differential equations describing the jetsam movement in the bulk and wake phases were solved numerically. The main work was to determine the parameters of the basic model, which was carried out by means of an advanced multi-step parameter fitting procedure. A more general form was established, which is based on direct linkage with the operating parameters that can be directly set and measured on the system. Comparisons with very diverse measured data sets available in the literature prove the accuracy of this model. Additional comparisons pointed out that the realization of this model is numerically inexpensive as it is several orders of magnitude faster than the available 2D and 3D models.

The Combined Thermohydraulics-Neutronics Code TRAB-SMABRE for 3D Plant Transient and Accident Analyses

2004 ◽  
Author(s):  
Miettinen Jaakko ◽  
Vanttola Timo ◽  
Daavittila Antti ◽  
Ra¨ty Hanna
Keyword(s):  
Reactor Core ◽  
3D Models ◽  
Separate Flow ◽  
Phase Behaviour ◽  
Circulation System ◽  
Two Phase ◽  
One Dimensional ◽  
Equation Formulation ◽  
The Core ◽  
New Development

TRAB-3D models the PWR and BWR reactor core using the two-group diffusion equations in homogenised fuel assembly geometry with a sophisticated nodal method. Thermohydraulics is described using four equation formulation. The stand-alone version of the code also describes thermohydraulics of the rest of the BWR circuit with one dimensional components. The SMABRE code models the thermohydraulics of light water reactors. The five equation formulation with the drift flux phase separation is modelling the two-phase behaviour. Conservation equations are solved for the phase mass, mixture momentum and phase energy. Additional equations are for the noncondensables in gas and boron in liquid. The TRAB-3D and SMABRE codes have been coupled earlier by using the parallel coupling principle, where in the core section the 3-dimensional TRAB core, and the parallel channel coarse SMABRE core are solved in parallel, but rest of the circulation system is solved with SMABRE. As a new development the internal coupling to meet new requirements for the PWR and BWR transient analyses is being realised. Both the circuit and core thermohydraulics are solved in SMABRE. The core thermohydraulics solution inside the core wide iterations is repeated to allow rapid power changes. These are the fast pressure changes, control rod ejection and ATWS. The numerical solution in SMABRE has been improved to allow full core simulation with separate flow channel for each fuel element of a BWR core. For the PWR plants the method is used as well by simulating the core by one-dimensional parallel channels. New development is needed for the open core calculation.

scholarly journals Analysis of load distribution in tooth-implant supported fixed partial dentures by the use of resilient abutment

2016 ◽  
Vol 144 (3-4) ◽  
pp. 188-195 ◽  
Author(s):  
Mirko Glisic ◽  
Dragoslav Stamenkovic ◽  
Aleksandar Grbovic ◽  
Aleksandar Todorovic ◽  
Aleksa Markovic ◽  
...  
Keyword(s):  
Bone Tissue ◽  
Load Distribution ◽  
Maximum Stress ◽  
3D Models ◽  
Similar Distribution ◽  
Vertical Force ◽  
Equal Distribution ◽  
Stress And Deformation ◽  
Von Mises ◽  
Distribution Of Stress

Introduction. Differences between the tooth and implant response to load can lead to many biological and technical implications in the conditions of occlusal forces. Objective. The objective of this study was to analyze load distribution in tooth/implant-supported fixed partial dentures with the use of resilient TSA (Titan Shock Absorber, BoneCare GmbH, Augsburg, Germany) abutment and conventional non-resilient abutment using finite element method. Methods. This study presents two basic 3D models. For one model a standard non-resilient abutment is used, and on the implant of the second model a resilient TSA abutment is applied. The virtual model contains drawn contours of tooth, mucous membranes, implant, cortical bones and spongiosa, abutment and suprastructure. The experiment used 500 N of vertical force, applied in three different cases of axial load. Calculations of von Mises equivalent stresses of the tooth root and periodontium, implants and peri-implant tissue were made. Results. For the model to which a non-resilient abutment is applied, maximum stress values in all three cases are observed in the cortical part of the bone (maximum stress value of 49.7 MPa). Measurements of stress and deformation in the bone tissue in the model with application of the resilient TSA abutment demonstrated similar distribution; however, these values are many times lower than in the model with non-resilient TSA abutment (maximum stress value of 28.9 MPa). Conclusion. Application of the resilient TSA abutment results in more equal distribution of stress and deformations in the bone tissue under vertical forces. These values are many times lower than in the model with the non-resilient abutment.

Effect of Shock Loading on the Microstructure of Uniloy 326

1974 ◽  
Vol 32 ◽  
pp. 504-505
Author(s):  
K. P. Staudhammer ◽  
L. E. Murr
Keyword(s):  
Grain Size ◽  
Shock Loading ◽  
Current Investigation ◽  
Two Phase ◽  
05 C ◽  
Shock Deformation ◽  
Heat Treated

The effect of shock loading on a variety of steels has been reviewed recently by Leslie. It is generally observed that significant changes in microstructure and microhardness are produced by explosive shock deformation. While the effect of shock loading on austenitic, ferritic, martensitic, and pearlitic structures has been investigated, there have been no systematic studies of the shock-loading of microduplex structures.In the current investigation, the shock-loading response of millrolled and heat-treated Uniloy 326 (thickness 60 mil) having a residual grain size of 1 to 2μ before shock loading was studied. Uniloy 326 is a two phase (microduplex) alloy consisting of 30% austenite (γ) in a ferrite (α) matrix; with the composition.3% Ti, 1% Mn, .6% Si,.05% C, 6% Ni, 26% Cr, balance Fe.

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

Shock consolidation of Ni-Ti alloy powder

1986 ◽  
Vol 44 ◽  
pp. 430-431
Author(s):  
Naresh N. Thadhani ◽  
Thad Vreeland ◽  
Thomas J. Ahrens
Keyword(s):  
Alloy Powder ◽  
Amorphous Material ◽  
Ti Alloy ◽  
Two Phase ◽  
Near Surface ◽  
Optical Micrograph ◽  
Shock Compaction ◽  
Powder Particles ◽  
Ti Powder ◽  
Rapidly Solidified

A spherically-shaped, microcrystalline Ni-Ti alloy powder having fairly nonhomogeneous particle size distribution and chemical composition was consolidated with shock input energy of 316 kJ/kg. In the process of consolidation, shock energy is preferentially input at particle surfaces, resulting in melting of near-surface material and interparticle welding. The Ni-Ti powder particles were 2-60 μm in diameter (Fig. 1). About 30-40% of the powder particles were Ni-65wt% and balance were Ni-45wt%Ti (estimated by EMPA).Upon shock compaction, the two phase Ni-Ti powder particles were bonded together by the interparticle melt which rapidly solidified, usually to amorphous material. Fig. 2 is an optical micrograph (in plane of shock) of the consolidated Ni-Ti alloy powder, showing the particles with different etching contrast.

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