scholarly journals Evaluation of unprotected steel beam temperature during fire using CFD simulation

2021 ◽  
Vol 352 ◽  
pp. 00017
Author(s):  
Paulína Magdolenová
Keyword(s):  
Thermal Loading ◽  
Cfd Simulation ◽  
Steel Structure ◽  
Fire Dynamics ◽  
Standard Fire ◽  
Fire Modelling ◽  
Computational Fluid Dynamics Cfd ◽  
Fire Curve ◽  
Cfd Method ◽  
In Fire

Fire resistance of building construction is essential part of the design process. Thermal loading of loadbearing elements can be obtained by using simplified standard fire curve or advanced numerical fire model. The paper shows the process of numerical fire modelling in unprotected steel structure carpark using the Computational Fluid Dynamics (CFD) method. In Fire Dynamics Simulator (FDS) software, three scenarios are created to represent open, semi-open and closed carpark building. The resultant HEB500 beam temperatures are compared with standard evaluated temperatures.

Fire Performance of Reinforced Concrete Beams Strengthened with CFRP Sheets Bonded with an Inorganic Adhesive

2011 ◽  
Vol 255-260 ◽  
pp. 574-579 ◽  
Author(s):  
Fu Xiong Wan ◽  
Wen Zhong Zheng
Keyword(s):  
Reinforced Concrete ◽  
Steel Structure ◽  
Reinforced Concrete Beams ◽  
Bottom Surface ◽  
Rc Beams ◽  
Cfrp Sheets ◽  
Standard Fire ◽  
Fire Curve ◽  
Fireproof Coating ◽  
In Fire

Considering softening temperatures of ordinary organic epoxy adhesives are too low, this study develops an inorganic adhesive which strength at 600°C is not lower than that at normal room temperature. Four reinforced concrete (RC) beams strengthened with CFRP sheets bonded with the inorganic adhesive are tested. The fire protection of the CFRP sheets is done using the thick-type fireproofing coatings for tunnel (TFCT) and steel structure (TFCSS) respectively. All specimens are tested in the furnace together. Specimens are exposed to fire for 1.5 hours in according to the ISO834 standard fire curve, and then naturally cooled for 1 hour. CFRP sheets at center point of bottom surface of beams are 300~470°C, and the corresponding displacements at mid-span are 1/1400~1/318 of the actual span. The CFRP sheets keep a good state and are tightly bonded on RC beams by the inorganic adhesive after fire. Temperature and deformation are analyzed by ABAQUS, and the simulation and measured results are in good agreement. The results indicate that, under the protection of fireproof coating, the CFRP sheets work well in cooperation with RC beams and slabs during fire. TFCSS is inferior to TFCT because the former is easier to drop and crack in fire. Analysis method of the finite element supplies a good way to temperature field and deformation calculation of structures in fire.

scholarly journals Vortex Dynamics Analysis of Straight-Body-Type-Fuselage Fighter Using CFD Simulation

2020 ◽  
Author(s):  
Sutrisno Sutrisno ◽  
Deendarlianto Deendarlianto ◽  
Tri Agung Rohmat ◽  
Setyawan Bekti Wibowo ◽  
Sigit Iswahyudi
Keyword(s):  
Performance Improvement ◽  
Cfd Simulation ◽  
Vortex Generation ◽  
Vortex Dynamic ◽  
Body Type ◽  
Surface Pressure Distribution ◽  
Negative Surface ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method ◽  
Velocity Pressure

The choice for using a fighter fuselage in a fighter jet design affects a vortex generation advantageous in maneuverability. To study the effect of straight-body-type-fuselage (SBTF) on the vortex dynamic, a computational fluid dynamics (CFD) method is used, in order to simulate a model of SBTF fighter. The simulation uses Q-criterion to probe vortices, and a logarithmic grid to emphasize the micro-gridding effect of the turbulent boundary layer. The results show detailed quantitative velocity, pressure, trajectory of the vortex core, and wing negative surface pressure distribution (SPD), providing clear pictures of opportunity for performance improvement, better lift, agility, and maneuverability of a fighter if a model requires a new design.

scholarly journals CFD Simulation of Airflow Dynamics During Cough Based on CT-Scanned Respiratory Airway Geometries

Symmetry ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 595 ◽  
Author(s):  
Guiyue Kou ◽  
Xinghu Li ◽  
Yan Wang ◽  
Mouyou Lin ◽  
Yuping Zeng ◽  
...  
Keyword(s):  
Flow Rate ◽  
Cfd Simulation ◽  
Peak Flow ◽  
Maximum Velocity ◽  
Flow Distribution ◽  
Peak Flow Rate ◽  
Respiratory Airway ◽  
Computational Fluid Dynamics Cfd ◽  
Left And Right ◽  
Cfd Method

The airflow dynamics observed during a cough process in a CT-scanned respiratory airway model were numerically analyzed using the computational fluid dynamics (CFD) method. The model and methodology were validated by a comparison with published experimental results. The influence of the cough peak flow rate on airflow dynamics and flow distribution was studied. The maximum velocity, wall pressure, and wall shear stress increased linearly as the cough peak flow increased. However, the cough peak flow rate had little influence on the flow distribution of the left and right main bronchi during the cough process. This article focuses on the mathematical and numerical modelling for human cough process in bioengineering.

CFD Simulation of Heat Transfer of Pulsating Gas in a Pipe

2014 ◽  
Vol 687-691 ◽  
pp. 623-626
Author(s):  
Zhi Ren Yin ◽  
Li Jun Yang ◽  
Run Ze Duan
Keyword(s):  
Heat Transfer ◽  
Cfd Simulation ◽  
Cfd Model ◽  
Pulse Combustor ◽  
Flow Development ◽  
Steady Flow Condition ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method ◽  
High Level ◽  
The Heat Transfer Coefficient

Numerical Simulation of pulsating flow in a pulse combustor tailpipe was performed using computational fluid dynamics (CFD) method. The flow in the pipe was characterized by periodic pulsating. The influence of this pulsating includes incomplete flow development and high level of convective heat transfer rate, and both were considered and investigated by the CFD model. Compared with the steady flow condition, results showed that the heat transfer coefficient and Nusselt number were 2.35 times higher.

scholarly journals VERIFICATION OF SCHRENK METHOD FOR WING LOADING ANALYSIS OF SMALL UNMANNED AIRCRAFT USING NAVIERSTOKES BASED CFD SIMULATION

2018 ◽  
Vol 15 (2) ◽  
pp. 161 ◽  
Author(s):  
Arifin Rasyadi Soemaryanto ◽  
Nurhayyan Halim Rosid
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Approximation Method ◽  
Cfd Simulation ◽  
Unmanned Aircraft ◽  
Navier Stokes ◽  
Aerodynamic Load ◽  
Wing Loading ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method

Prediction of an aerodynamic load acting on a wing or usually called wing loading becomes an important stage for structural analysis. Several methods have been used in estimating the wing loading. Schrenk approximation method is commonly used to achieve the fast estimation of lift distribution along wingspan, but in order to achieve a high level accuracy of aerodynamic prediction, computational fluid dynamics (CFD) with Navier Stokes-based equation can be used. LAPAN Surveillance UAV (LSU series) has been chosen to represent an aerodynamics analysis on generic small unmanned aircraft with twinboom vertical stabilizer configuration. This study was focused to verify the Schrenk approximation method using high accuracy numerical simulation (CFD). The goal of this study was to determine the lift distribution along wingspan and a number of errors between Schrenk approximation and CFD method. In this study, Schrenk approximation result showed similarity with the CFX simulation. So the two results have been verified in analysis of wing loading. ABSTRAKPrediksi dari beban aerodinamika yang terjadi pada sayap menjadi salah satu tahap yang penting dalam analisis struktur perancangan pesawat. Beberapa metode telah digunakan untuk mengestimasi besarnya beban aerodinamika pada sayap. Metode Schrenk umum digunakan untuk estimasi cepat perhitungan besar distribusi gaya angkat di sepanjang sayap. Guna mencapai tingkat akurasi yang tinggi dari prediksi aerodinamika, simulasi Computational Fluid Dynamics (CFD) dengan berbasis persamaan Navier-Stokes dapat digunakan. Pesawat nirawak LSU dipilih untuk merepresentasikan analisis aerodinamika pada pesawat nirawak dengan konfigurasi twin-tailboom pusher. Fokus dari studi yang dilakukan adalah untuk memverifikasi dari metode pendekatan dari Schrenk dengan menggunakan metode yang memiliki akurasi tinggi seperti simulasi CFD. Tujuan dari studi adalah untuk menghitung distribusi gaya angkat sepanjang sayap dan menentukan seberapa besar error dari kedua metode.

CFD Simulation of the Gas-Liquid Flow on the Ripple Tray

2012 ◽  
Vol 472-475 ◽  
pp. 1605-1609
Author(s):  
Bin Jiang ◽  
Zhong Tao Li ◽  
Lu Hong Zhang
Keyword(s):  
Cross Sections ◽  
Cfd Simulation ◽  
Euler Method ◽  
Two Phase ◽  
Sieve Tray ◽  
Computational Fluid Dynamics Cfd ◽  
Gas Liquid Flow ◽  
Experimental Values ◽  
Cfd Method ◽  
Superficial Gas Velocity

The ripple tray is a sieve tray without downcomers, in which the liquid contacts with the upward gas counter-currently. The hydrodynamics performance in ripple tray columns was investigated with the computational fluid dynamics (CFD) method. Various superficial gas velocity and liquid loads were simulated for the tray with cylindrical cross sections using the Euler-Euler method. The modeling results were validated by comparing the calculated liquid height on the ripple tray with the experimental values. The developed CFD model is found to be able to predict the two phase flow patterns in ripple tray columns and provide useful information for further design of ripple tray.

Numerical Simulation on Water Mist Fire Suppression System Operation in Typical Environment

2013 ◽  
Vol 732-733 ◽  
pp. 491-494
Author(s):  
Peng Liu
Keyword(s):  
Computer Technology ◽  
Fire Suppression ◽  
Rapid Development ◽  
Water Mist ◽  
System Operation ◽  
Fire Dynamics ◽  
Computational Fluid Dynamics Cfd ◽  
The Cost ◽  
In Fire ◽  
Suppression System

Water mist fire suppression system is widely used in many places, for its little damage and greatly reduces the cost of extinguishing fire. But because of the intricate extinguishing mechanism of water mist, it is difficult to design an optimal water mist fire suppression system in a typical place. With the rapid development of computer technology, computational fluid dynamics (CFD) has already been proved to be a useful and powerful tool in fire safety science. Fire Dynamics Simulator (FDS) is used to simulated the interaction of water mist and fire in a typical fire scenario in this paper. Two design schemes of water mist system are compared to prove which one is better. Through simulated by FDS on these two cases, the water mist system with 4 sprinklers is suited in the restroom.

CFD Simulation of Smoke Spread Through Elevator Shafts During Fires in High Rise Buildings

2015 ◽  
Author(s):  
Qize He ◽  
Ofodike A. Ezekoye ◽  
Beth Tubbs ◽  
Carl Baldassarra
Keyword(s):  
Cfd Simulation ◽  
Gas Temperature ◽  
Fire Dynamics ◽  
High Rise ◽  
Fire Dynamics Simulator ◽  
Smoke Spread ◽  
Outflow Rate ◽  
Computational Fluid Dynamics Cfd ◽  
Temperature And Pressure ◽  
Two Phases

Smoke spread through the elevator shafts of high rise buildings has been numerically investigated using the Fire Dynamics Simulator (FDS), which is a computational fluid dynamics (CFD) program suitable for fire induced heat and mass transfer. A model of a high rise building was developed and a fire was set at the first level. The smoke spread process through the elevator shafts was evaluated. The process can be divided into two phases. In the first phase, the smoke gradually fills the shafts, and the gas temperature and pressure in the shafts are transient. After this phase, the smoke fully fills the shafts, the temperature and pressure in the shaft are almost steady, which suggests that the smoke inflow rate equals the outflow rate. Throughout the process, the spatial distributions of temperature and pressure in the elevator shaft under fire situations were reported. The hot fire product gases entering the shaft causes a stack effect, which transports smoke to the upper levels. A method of partially enclosing the elevator lobbies was also investigated by the CFD simulation. The results were compared with the unenclosed situation, and showed that enclosing lobbies not only increases the time needed for the smoke to fully fill the shafts, but also reduces the temperature and pressure differences in the shafts.

Effect Investigation of the Circumferential Grooves on the Static Characteristics of Hydrodynamic Journal Bearing Using CFD Method

2014 ◽  
Vol 643 ◽  
pp. 316-321
Author(s):  
Qing Zheng Meng ◽  
Lin Cai ◽  
Miao He
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Model ◽  
Cfd Simulation ◽  
Journal Bearing ◽  
Static Characteristics ◽  
Computational Fluid Dynamics Cfd ◽  
Hydrodynamic Journal Bearing ◽  
Good For ◽  
Cfd Method

The performance of a hydrodynamic journal bearing with different center circumferential grooves (CGs) is investigated using Computational fluid dynamics (CFD) simulation. The influences of the CG extended angel have been investigated based on the numerical model. The results show that the CG of millimeter range depth in load zone is not good for the bearing performance but it is opposite in unload zone.

CFD Modeling and Validation of Steel Lazy-Wave Riser VIV

2016 ◽  
Author(s):  
Yiannis Constantinides ◽  
Maeanna Stover ◽  
Amanda Steele ◽  
Markku Santala
Keyword(s):  
Cfd Simulation ◽  
Cfd Modeling ◽  
Dynamic Stresses ◽  
Global Response ◽  
Computational Fluid Dynamics Cfd ◽  
Improved Performance ◽  
Cfd Method ◽  
Viv Suppression ◽  
Harsh Conditions ◽  
Good Agreement

The steel lazy wave riser is an emerging solution for deepwater applications in harsh conditions. The addition of buoyancy to provide the unique “lazy wave” shape reduces the dynamic stresses at the touchdown zone due to vessel motions and waves and results in improved performance. However, as the buoyant region cannot be easily fitted with VIV suppression, VIV becomes a critical aspect of the design. The present study progresses the modeling effort presented in [2] to model and understand the global response of a deepwater lazy wave riser using computational fluid dynamics (CFD). An industry first CFD simulation of a steel lazy wave riser under in-plane currents is presented and validated against experiments with two different configurations. Results show good agreement between CFD and experiments and provide an initial understanding of the riser response under in-plane currents. The CFD method developed has been validated and will be an important tool for the design of lazy wave risers.

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