Numerical Simulation of Changes in the Thermal Condition of Soils under the Effect of Channel Change of a River Bed

2004 ◽  
Vol 38 (1) ◽  
pp. 27-29
Author(s):  
V. A. Stetyukha
Keyword(s):  
Numerical Simulation ◽  
Thermal Condition ◽  
Channel Change ◽  
River Bed

Turbine Split Rings Thermal Design Using Conjugate Numerical Simulation

2013 ◽  
Author(s):  
Aleksei S. Tikhonov ◽  
Andrey A. Shvyrev ◽  
Nikolay Yu. Samokhvalov
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Gas Turbine ◽  
Gas Dynamics ◽  
Thermal Condition ◽  
Fuel Efficiency ◽  
Thermal Design ◽  
Design Practice ◽  
Gas Temperature ◽  
Split Ring

One of the key factors ensuring gas turbine engines (GTE) competitiveness is improvement of life, reliability and fuel efficiency. However fuel efficiency improvement and the required increase of turbine inlet gas temperature (T*g) can result in gas turbine engine life reduction because of hot path components structural properties deterioration. Considering circumferential nonuniformity, local gas temperature T*g can reach 2500 K. Under these conditions the largest attention at designing is paid to reliable cooling of turbine vanes and blades. At present in design practice and scientific publications comparatively little attention is paid to detailed study of turbine split rings thermal condition. At the same time the experience of modern GTE operation shows high possibility of defects occurrence in turbine 1st stage split ring. This work objective is to perform conjugate numerical simulation (gas dynamics + heat transfer) of thermal condition for the turbine 1st stage split ring in a modern GTE. This research main task is to determine the split ring thermal condition by defining the conjugate gas dynamics and heat transfer result in ANSYS CFX 13.0 package. The research subject is the turbine 1st stage split ring. The split ring was simulated together with the cavity of cooling air supply from vanes through the case. Besides turbine 1st stage vanes and blades have been simulated. Patterns of total temperature (T*Max = 2000 °C) and pressure and turbulence level at vanes inlet (19.2 %) have been defined based on results of calculating the 1st stage vanes together with the combustor. The obtained results of numerical simulation are well coherent with various experimental studies (measurements of static pressure and temperature in supply cavity, metallography). Based on the obtained performance of the split ring cooling system and its thermal condition, the split ring design has been considerably modified (one supply cavity has been split into separate cavities, the number and arrangement of perforation holes have been changed etc.). All these made it possible to reduce considerably (by 40…50 °C) the split ring temperature comparing with the initial design. The design practice has been added with the methods which make it possible to define thermal condition of GTE turbine components by conjugating gas dynamics and heat transfer problems and this fact will allow to improve the designing level substantially and to consider the influence of different factors on aerodynamics and thermal state of turbine components in an integrated programming and computing suite.

scholarly journals Numerical simulation of the effect of material catalytic converter on gas emission

2018 ◽  
Vol 204 ◽  
pp. 04018
Author(s):  
Suheni ◽  
Rudy Sunoko ◽  
Slamet Wahyudi ◽  
Amin S Leksono
Keyword(s):  
Numerical Simulation ◽  
Mass Fraction ◽  
Thermal Condition ◽  
Catalytic Converter ◽  
Human Life ◽  
High Mass ◽  
Gas Emission ◽  
Rest Time ◽  
Fluent Software ◽  
Co Gas

The disposal of gas emission from vehicle is the biggest contributor to the environmental pollution which generates most carbon monoxide, hydrocarbon, and lead (Pb=Plumbum). Those substance particulates are pollutants and harmful for both the environment and human life. One of the innovations that can reduce the pollutive particulates is to reduce CO gas by assembling a catalytic converter are displayed. In order to find out the effect of catalytic converter absorption toward (CO) gas particulate, varied with various materials in an environmentally friendly catalytic converter, a simulation using fluent software is carried out. From the simulation, it is seen a significant thermal condition and CO mass fraction absorption from various different materials, by applying mass fraction of CO=0.04;N2=0.8796; and O2=0.12, the decrease of high mass fraction (decrease of CO=0.004 mass fraction) occurs at the channel centre area due to the mass fraction of various materials that moves away from the center with a longer rest time (high conversion) at the surrounding channel.

The Thermal Elastohydrodynamic Lubrication Analysis of Seawater-Lubricated Thordon Bearing

2011 ◽  
Vol 396-398 ◽  
pp. 2507-2510 ◽  
Author(s):  
Li Jing Zhang ◽  
You Qiang Wang
Keyword(s):  
Numerical Simulation ◽  
Film Thickness ◽  
Thermal Effect ◽  
Thermal Condition ◽  
Reynolds Equation ◽  
Elastohydrodynamic Lubrication ◽  
Shaft Diameter ◽  
Pressure Peak

Based on Reynolds equation, the numerical simulation of thermal elstohydronamic lubrication for seawater-lubricated thordon bearing was carried out, the effects of the load, the speed and the shaft diameter on the pressure and the film thickness were discussed. The results show that thermal effect has little effect on the pressure, but the film thickness under the thermal condition is smaller than isothermal. The pressure peak is increased and the film thickness is decreased greatly with the increase of load. The pressure peak is decreased and the film thickness is increased greatly with the increase of speed.

Thermo-Structural Coupling Numerical Analysis of Rectangular Vessel

2014 ◽  
Vol 620 ◽  
pp. 14-17
Author(s):  
Chun Lai Tian ◽  
Shan Zhou ◽  
Li Yong Han
Keyword(s):  
Numerical Simulation ◽  
Contact Surface ◽  
Thermal Condition ◽  
Maximum Stress ◽  
Structural Model ◽  
Structural Characteristics ◽  
Structural Response ◽  
Maximum Displacement ◽  
Structural Coupling ◽  
Contact Surfaces

A rectangular vessel has two contact surfaces with different materials, iron and copper. In order to investigate thermo-structural characteristics of the vessel, the structural model is developed. The structural analysis is coupled with the thermal condition. The numerical simulation model with hex eight-node thermally coupled brick elements is established and solved by finite element method. The results show that the maximum stress with 112.5 MPa is distributed on the contact surface between the different materials. Because of the different materials’ expansions, there is stress concentration on the contact surface. The maximum displacement is 0.27 mm, almost the same at different pressure loads. The maximum stress increased to about 300 MPa as the temperature increase. The structural response caused by thermal expansion is important for the vessel design.

Numerical simulation of photovoltaic panel thermal condition under wind convection

2016 ◽  
Author(s):  
Houssam Assila ◽  
Elhachmi Essadiqi ◽  
Mustapha Faqir ◽  
Mohamed Meziane ◽  
Fathi Ghanameh ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Thermal Condition ◽  
Photovoltaic Panel

scholarly journals Numerical Simulation of Velocity Field around Two Columns of Tandem Piers of the Longitudinal Bridge

Fluids ◽  
2020 ◽  
Vol 5 (1) ◽  
pp. 32
Author(s):  
Hongliang Qi ◽  
Junxing Zheng ◽  
Chenguang Zhang
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Velocity Field ◽  
Average Velocity ◽  
Cfd Simulations ◽  
Velocity Change ◽  
River Bed ◽  
Computational Fluid Dynamics Cfd ◽  
Lateral Range

This research explores the effects of different spans of two columns of tandem piers on the characteristics of x-velocity near the river bed based on computational fluid dynamics (CFD) simulations. With a span shorter than 27.5D (D is the diameter of piers), the shape and the lateral range of the x-velocity increases with the increase of distance downwards the x-direction. For the area between the tandem piers and the wall, the VRi/VR1 (the ratio of the x-velocity at the i-th row to the x-velocity of the first row in each model) near the wall increases up to 1.26. For the area between the two columns of tandem piers, the profile of VRi/VR1 changes from a “∩-shape” to an “M-shape” in each model. RAVC (average velocity change ratio) of different spans increases gradually and tends to be stable with the increases of the span. The largest RAVC is about −17.66% with a span of 0.52 m. The RMV (the ratio of the maximum x-velocity among piers in each row in different models to the maximum x-velocity of the two piers arranged side by side) of piers in the first row of different models is around 0.95. The RMV becomes 0.82 at the second pier in each model when the span is shorter than 27.5D, and increases to 0.91 if the span is longer than 27.5D. If the span is longer than 27.5D, the RMV of different piers are close to each other from the 2nd pier to the last one.

scholarly journals An Analysis of the Impact Exerted on Bearing Capacity of Pier and Pile after Increasing Pile Cap Height

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Xianbin Huang ◽  
Chenyang Liu ◽  
Song Hou ◽  
Chunyang Chen ◽  
Yahong Wangren ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Bearing Capacity ◽  
Seismic Waves ◽  
Bending Moment ◽  
Simulation Method ◽  
Ground Acceleration ◽  
Numerical Simulation Method ◽  
River Bed ◽  
Pile Cap ◽  
The Impact

An analysis was carried out in this paper on the bearing capacity of pier pile and seismic performance rule when the low-pile cap is increased by 1 meter, 2 meters, and 3 meters. The bottom of the pile cap of pier no. 11 of Minjiang River bridge faces three “lows”: 7.6 meters lower than island, 4.6 meters lower than natural river bed, and 6.5 meters lower than low water level. The numerical simulation method is adopted to input three seismic waves of Wolong, Bajiao, and EL to evaluate the bearing capacity of pier and pile under strong earthquakes. Using the standard formula and numerical simulation method, it is observed that the bending moment and axial force of bridge pier show an insignificant change under different seismic waves when the pile cap is increased by 0–3 meters. With peak ground acceleration increased to 0.35 g, the vertical bearing capacity and flexural capacity of pier and pile gratify the requirements; however, the pile foundation will be subject to compression and bending damage.

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