NUMERICAL MODELING OF A VERY LARGE CRUDE OIL CARRIER USING ANSYS CFX: A CASE STUDY OF SALINA

2021 ◽  
Vol 161 (A4) ◽  
Author(s):  
H Hakimzadeh ◽  
M Torabi Azad ◽  
M A Badri ◽  
F Azarsina ◽  
M Ezam
Keyword(s):  
Numerical Simulation ◽  
Crude Oil ◽  
Drag Force ◽  
Performance Monitoring ◽  
Numerical Models ◽  
Frictional Resistance ◽  
Simulation Method ◽  
Scaled Model ◽  
Ansys Cfx ◽  
The Difference

Specification of the frictional resistance values of tankers is the first step in managing their fuel consumption. Drag force of a very large crude oil carrier has been calculated using the numerical simulation method. With application of the ANSYS CFX software, the scaled model of the mentioned tanker with the length of 2.74 meters, width of 0.5 meters, draft of 0.17 meters was used for numerical simulation of the drag force in the tanker. Furthermore, the numerical solution of the drag force of the model was performed for 5 different speeds ranging from 0.65 to 0.85m/s. Based on the validations carried out, with mean drafts of 8 and 16.5cm, the difference between the results of the experimental and numerical models at low speeds was about 7%. However, the difference was observed to be up to 15% at higher Froude numbers. The results of the present study with respect to the SALINA are based on the method presented in ISO 19030 standard addressing the performance monitoring during vessel servicing.

Numerical Modeling of a Very Large Crude Oil Carrier Using ANSYS CFX: A Case Study of SALINA

2019 ◽  
Vol 161 (A4) ◽  
Keyword(s):  
Numerical Simulation ◽  
Crude Oil ◽  
Drag Force ◽  
Performance Monitoring ◽  
Numerical Models ◽  
Frictional Resistance ◽  
Simulation Method ◽  
Scaled Model ◽  
Ansys Cfx ◽  
The Difference

Specification of the frictional resistance values of tankers is the first step in managing their fuel consumption. Drag force of a very large crude oil carrier has been calculated using the numerical simulation method. With application of the ANSYS CFX software, the scaled model of the mentioned tanker with the length of 2.74 meters, width of 0.5 meters, draft of 0.17 meters was used for numerical simulation of the drag force in the tanker. Furthermore, the numerical solution of the drag force of the model was performed for 5 different speeds ranging from 0.65 to 0.85m/s. Based on the validations carried out, with mean drafts of 8 and 16.5cm, the difference between the results of the experimental and numerical models at low speeds was about 7%. However, the difference was observed to be up to 15% at higher Froude numbers. The results of the present study with respect to the SALINA are based on the method presented in ISO 19030 standard addressing the performance monitoring during vessel servicing.

A Study on the Numerical Simulation Method for the NC Incremental Sectional Forming

2014 ◽  
Vol 988 ◽  
pp. 241-244
Author(s):  
Hu Zhu ◽  
Wen Wen Lin ◽  
Jin Lan Bai
Keyword(s):  
Numerical Simulation ◽  
Digital Simulation ◽  
Simulation Method ◽  
Forming Quality ◽  
Numerical Simulation Method ◽  
Simulation Results ◽  
The Difference

The digital simulation method for NC incremental sectional forming is studied and the forming effect of NC incremental integral forming and sectional forming is analyzed through the digital simulation method in this paper. Digital simulation results show that the proposed simulation method for NC incremental sectional forming is reasonable and achievable. The difference of the forming quality between NC incremental sectional forming and integral forming is small. The sectional forming method has feasibility.

scholarly journals PENAMBAHAN LINGKARAN PELINDUNG PADA TURBIN AIR ROTOR SAVONIUS

INFO-TEKNIK ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 237
Author(s):  
Rendi Rendi ◽  
Firda Herlina
Keyword(s):  
Drag Force ◽  
Power Plants ◽  
Slow Flow ◽  
Turbine Performance ◽  
Ansys Cfx ◽  
Water Turbine ◽  
The Difference ◽  
Main Component ◽  
Flow Power ◽  
Positive Work

The savonius water turbine has a main component, which is blade, the concave portion has a positive work and the convex blade has a negative work. Concave profiles in advancing blade as flow catchers and convex profiles on the returning blade as reflecting flow so that there is a difference in torque. The greater the torque difference the better the turbine performance. The way to enlarge this torque difference is by enlarging the drag force. This study aims to increase the difference in torque by adding a protective circle behind the blade advancing blade. This research uses Solidwork software to design turbines and Ansys CFX 19.2 software to analyze torque. Based on the analysis results, the addition of a protective circle can increase the difference in torque. The largest torque value is owned by the turbine with the addition of a protective circle 10 mm from the blade of 46,524 Nm, the largest power value is owned by the turbine with the addition of a protective circle 10 mm by 182 Watts and the greatest efficiency value is owned by the turbine with the addition of a protective circle 10 mm 50% turbine. The addition of a protective circle 10 mm away from the blade is the most optimal turbine geometry for use in water flow power plants, especially in slow-flow rivers.

Proposal of a Numerical Simulation Method for Elastic, Failure and Collapse Behaviors of Structures and its Application to Seismic Response Analysis of Masonry Walls

2011 ◽  
Vol 6 (1) ◽  
pp. 51-69 ◽  
Author(s):  
Aiko Furukawa ◽  
◽  
Junji Kiyono ◽  
Kenzo Toki ◽  
◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Simulation Method ◽  
Masonry Wall ◽  
Structural Deformation ◽  
Elastic Behavior ◽  
Response Analysis ◽  
Wall Models ◽  
The Difference ◽  
Seismic Behaviors

We propose a dynamic analysismethod – a refined version of the DEM- that can simulate three-dimensional elastic, failure and collapse behaviors of structures. A structure is modeled as an assembly of rigid elements. Interaction between elements is modeled using multiple springs and multiple dashpots attached to surfaces of the elements. The elements are assumed to be rigid, but the method allows the simulation of structural deformation by permitting penetration between elements. There are two types of springs: one is a restoring spring to simulate elastic behavior before failure and the other is a contact spring for simulating contact and recontact between elements. A contact dashpot is also used to dissipate the energy of contact. Structural failure is modeled by replacing restoring springs with contact springs and dashpots. A method for determining spring constants is also proposed. The validity of the method is confirmed by the numerical simulation of masonry wall models. First, the elastic behavior induced by an impact force is calculated. It is found that the elastic behavior determined using the proposed method is in good agreement with that determined using the finite element method. Second, the seismic behaviors of masonry wall models with different laying patterns and a wall model with reinforcement are analyzed. It is found that the proposed method allows expression of the difference in behavior due to different laying patterns and reinforcement. The validity of the proposed method is thus confirmed. The proposed method is suitable for simulating seismic behavior of masonry structures.

Effects of Framed Embankment for High-Grade Expressway in Permafrost Regions

2014 ◽  
Vol 505-506 ◽  
pp. 139-148 ◽  
Author(s):  
Wan Sheng Pei ◽  
Yuan Ming Lai ◽  
Ming Yi Zhang ◽  
Wen Bing Yu ◽  
Shuang Yang Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Thermal Stability ◽  
Global Warming ◽  
Scale Effects ◽  
Simulation Method ◽  
High Grade ◽  
Permafrost Table ◽  
The Difference ◽  
Thermal Stability Of ◽  
Permafrost Regions

Construction of high-grade highways is an important action to meet the requirement of communication and transportation in permafrost regions. Frame embankment is proposed to reduce the scale effects caused by wide pavement. Numerical simulation method is employed to analyze the improvement of frame embankment for thermal stability of roadbed, with the consideration of global warming. Compared the response of permafrost at symmetric position of each embankment to construction, the consistency degree of response is taken as decision fundament. Two indexes are selected, that is, the difference of permafrost table between the embankment and that at natural side, and the change of mean annual geothermal under the embankment. Additionally, the convenient for construction and wind-blown sand hazard are considered to determine reasonable frame space. So, numerical simulation of flow field of wind around embankments is carried out. It is concluded that the minimum space between two embankment is 6 m. The aim of this study is to provide scientific guidelines on construction of major permafrost engineering in the future.

Numerical Simulation Research of Tailor-Welded Blanks

2013 ◽  
Vol 690-693 ◽  
pp. 2625-2630
Author(s):  
Wei Gang Guo ◽  
Qi Lin Jin
Keyword(s):  
Numerical Simulation ◽  
Numerical Models ◽  
Simulation Methods ◽  
Forming Process ◽  
Simulation Research ◽  
Tailor Welded Blanks ◽  
Development Direction ◽  
Numerical Simulation Methods ◽  
The Difference ◽  
Square Box

Different numerical simulation methods on forming of tailor-welded blanks has been introduced with details, and the influence of various numerical models on the results of simulation was compared. Forming process of Square box was studied, and the difference between simulation results of two kinds of numerical modeling was discussed. The development direction of tailor-welded blanks CAE has been put forward.

Study on Collapse Numerical Simulation Method of Frame Structures Based on Explicit Dynamics

2014 ◽  
Vol 919-921 ◽  
pp. 226-238
Author(s):  
Kai Hu
Keyword(s):  
Numerical Simulation ◽  
Numerical Models ◽  
Simulation Method ◽  
Frame Structure ◽  
Structural Collapse ◽  
Explicit Finite Element ◽  
Explicit Dynamics ◽  
Numerical Simulation Method ◽  
Alternate Path Method ◽  
Numerical Calculation Method

According to the theory of collapse numerical simulation, the explicit finite element algorithm based on explicit dynamics was chose as the numerical calculation method. And combined with the plane RC frame collapse test and the example of ten layers frame structure, the wire frame model, integrated model and separate model were established and the alternate path method was adopted to study the simulate method of structural collapse. With the comparison of several aspects to the results, the rationality of the numerical simulation method and the applicability of the numerical models were verified respectively. At the same time, according to the complex pre-treatment process to the numerical simulation of structural collapse, an MFC program with the function of exporting APDL file which can generate wireframe models for structural collapse simulation in ANSYS/LS-DYNA was developed using VC++ language with the purpose of offering convenience to the numerical simulation process of structure collapse.

scholarly journals Some Effects on the Temperature of the Mine Air at the Heading Face

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Van Quang NGUYEN ◽  
Van Thinh NGUYEN ◽  
Cao Khai NGUYEN ◽  
Van Chung PHAM
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Temperature Distribution ◽  
Air Temperature ◽  
Significant Influence ◽  
Thermal Environment ◽  
Simulation Method ◽  
Forced Ventilation ◽  
Ansys Cfx ◽  
Ventilation Method

Currently, with the increase in mining output leading to deeper mining levels, the volume ofheading face serving production has also increased. The thermal environment tends to worsen whendigging deep due to the geothermal's effect, which increases the air temperature at the heading face.According to QCVN01/2011-BCT, the temperature at the heading face is not allowed to exceed 300C. Toensure this, in Vietnam today, mainly forced ventilation method uses local fans to provide a clean amountof air to ensure a favorable environment for workers. With the forced ventilation method, the duct positionis usually arranged on the side, and the distance from the duct mouth to the heading face is determined toensure that l < 6√s. In this study, a numerical simulation method by Ansys CFX software is applied tostudy the influence of several factors such as duct position, air temperature of duct, and roughnesscharacteristics of roadway on the temperature of the mine air at the heading face. The models are set upwith six duct positions and four air temperature of duct parameters. Model 1 (y =1.1 m) is better thanmodels 2 to 6 in terms of temperature distribution and the lowest temperature values. Four models havedifferent wind temperatures, and we can see the significant influence of the inlet air temperature of theduct on the thermal environment of the heading face. The results show that with the model T = 297.15K,the temperature value on the roadway length is guaranteed as specified < 303K. The result is a referencefor determining the duct position and cool for the high-temperature heading face.

Study on Critical Anchorage Length of Bolts by Numerical Simulation Method

2012 ◽  
Vol 204-208 ◽  
pp. 4771-4775
Author(s):  
Bo Wang ◽  
Jian Nan Zhou ◽  
Feng Nian Jin ◽  
Mei Rong Jiang
Keyword(s):  
Numerical Simulation ◽  
Comparative Analysis ◽  
Frictional Resistance ◽  
Simulation Method ◽  
Calculation Model ◽  
Measured Data ◽  
Anchorage Length ◽  
Numerical Simulation Method

Numerical simulation method was used to study the problems on critical anchorage length of bolts. 3-D calculation model was built by FLAC program. By numerical simulation calculations, the conclusion could be drawn: the frictional resistance contribution had nothing to do with drawing forces, and was relevant to the bond stiffness of anchor mortar. And comparative analysis results of one engineering example showed that the calculated values by the presented method agreed well with the measured data.

Effect Analysis of Nitrogen Injection on the Variation of “Oxidation Zone” in Coal Mine Gob Based on Numerical Simulation

2016 ◽  
Vol 9 (1) ◽  
pp. 47-54
Author(s):  
Jing Shen ◽  
Mingran Chang
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Heat Dissipation ◽  
Spontaneous Combustion ◽  
Oxidation Zone ◽  
Effect Analysis ◽  
Mine Fire ◽  
Nitrogen Injection ◽  
The Difference ◽  
Residual Coal

One of the main reasons for coal mine fire is spontaneous combustion of residual coal in gob. As the difference of compaction degree of coal and rock, the underground gob can be considered as a porous medium and divided into “three zones” in accordance with the criteria. The “three zones” are “heat dissipation zone”, “oxidation zone” and “choking zone”, respectively. Temperature programming experiments are taken and numerical simulation with obtained experimental data is utilized to analyze the distribution of “three zones” in this paper. Different width and depth of “oxidation zone” are obtained when the inlet air velocity is changed. As the nitrogen injection has inhibition effect on spontaneous combustion of residual coal in gob, nitrogen is injected into the gob. The widths of “oxidation zone” are compared before and after nitrogen injection. And ultimately the optimum location and volume of nitrogen injection are found out.

Sign in / Sign up

Export Citation Format

Share Document