Lukáš Valášek
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View article: Investigation of Various Fire Dynamics Simulator Approaches to Modelling Airflow in Road Tunnel Induced by Longitudinal Ventilation
Investigation of Various Fire Dynamics Simulator Approaches to Modelling Airflow in Road Tunnel Induced by Longitudinal Ventilation Open
The ability of computer simulations to model airflows in a tunnel can significantly contribute to the effectiveness of fire safety precautions. This study examines two ways of modelling the Polana tunnel (Slovakia) and its influence on the…
View article: Improvement of Modeling Velocity of Airflow Created by Emergency Ventilation in a Road Tunnel Using FDS 6
Improvement of Modeling Velocity of Airflow Created by Emergency Ventilation in a Road Tunnel Using FDS 6 Open
Road tunnels are equipped with various safety installations that enable the tunnel’s autonomous response to fire in order to ensure conditions suitable for safe self-rescue and evacuation. A key role in this effort is played by the monitor…
View article: Computing Aspects of Simulation Based on Conservation Laws Conducted on HPC Cluster
Computing Aspects of Simulation Based on Conservation Laws Conducted on HPC Cluster Open
The large amount of computing resources required for the simulation of complex natural processes demands a thorough analysis of the efficiency of the calculations and the conditions that influence it. This study investigates computing aspe…
View article: FDS simulation of smoke backlayering in emergency lay-by of a road tunnel with longitudinal ventilation
FDS simulation of smoke backlayering in emergency lay-by of a road tunnel with longitudinal ventilation Open
This paper investigates smoke movement and its stratification in a lay-by of a 900 m long road tunnel by computer simulation using Fire Dynamics Simulator. The lay-by is located upstream of the fire in its vicinity. The influence of lay-by…
View article: Possibilities of Increasing of Energy Efficiency in a Small Enterprises - Case Study
Possibilities of Increasing of Energy Efficiency in a Small Enterprises - Case Study Open
Reducing the electricity consumption is a current trend which has an economic, social and environmental impact. Measures which are outlined to increase efficiency are also supported by legislation and could be funded from the national or E…
View article: CFD-based fire spread visualization for improvement of road tunnel safety
CFD-based fire spread visualization for improvement of road tunnel safety Open
Teaching and training of operators of road and highway tunnels are necessary to increase their preparedness for incidents accompanied by fire and ensure safe tunnel operation. For such purposes Tunnel Traffic & Operation Simulator (TTOS) i…
View article: Stratification of fire smoke and testing aerosol in a road tunnel: computer simulation
Stratification of fire smoke and testing aerosol in a road tunnel: computer simulation Open
The damage of the road tunnel during tunnel ventilation tests is prevented by using specific testing aerosol representing fire smoke. This study compares optical density profiles of aerosol and fire smoke using the well-known FDS simulatio…
View article: Note on the impact of slope on smoke spread in tunnel fire conditions
Note on the impact of slope on smoke spread in tunnel fire conditions Open
Fires in road tunnels produce a large amount of smoke threatening passengers´ lives and health and tunnel facilities. The spread of fire smoke is influenced by various factors. In this paper, the Fire Dynamics Simulator system is used to s…
View article: Optical density of testing aerosol and fire smoke in a road tunnel with longitudinal ventilation: comparison by FDS6
Optical density of testing aerosol and fire smoke in a road tunnel with longitudinal ventilation: comparison by FDS6 Open
Specific testing aerosol is used for road tunnel ventilation tests to represent steady-state movement of fire smoke downstream of the fire and to avoid the damage of the tunnel. This study investigates the spread of aerosol in 240 m long s…
View article: Influence of slope and external temperature on smoke stratification in case of fire in bi-directional road tunnel
Influence of slope and external temperature on smoke stratification in case of fire in bi-directional road tunnel Open
Jet fan ventilation strategy in case of fire in bi-directional road tunnels is focused on maintaining smoke stratification. There are several factors influencing stratification under specific conditions. In this paper smoke movement during…
View article: Measurements and fire simulation models in road tunnels
Measurements and fire simulation models in road tunnels Open
Ventilation system of road tunnel is one of the most important parts of the tunnel safety equipment, especially in view of the emergency event in the tunnel with fire. Last year we presented the testing and the first in situ measurements o…
View article: On efficiency of fire simulation realization: parallelization with greater number of computational meshes
On efficiency of fire simulation realization: parallelization with greater number of computational meshes Open
Current fire simulation systems are capable to utilize advantages of high-performance computer (HPC) platforms available and to model fires efficiently in parallel. In this paper, efficiency of a corridor fire simulation on a HPC computer …
View article: Models of formation and spread of fire to increase safety of road tunnels
Models of formation and spread of fire to increase safety of road tunnels Open
\nFire safety of tunnels is an important issue which must be solved carefully during all phases of preparation, building and operation of each road tunnel. In this paper some particular results of a joint research project of the Institute …
View article: On Realization of Cinema Hall Fire Simulation Using Fire Dynamics Simulator
On Realization of Cinema Hall Fire Simulation Using Fire Dynamics Simulator Open
Currently known fire models are capable to describe fire dynamics in complex environments incorporating a wide variety of fire-related physical and chemical phenomena and utilizing large computational power of contemporary computers. In th…
View article: A note on parallel efficiency of fire simulation on cluster
A note on parallel efficiency of fire simulation on cluster Open
Current HPC clusters are capable to reduce execution time of parallelized tasks significantly. The paper discusses the use of two selected strategies of cluster computational resources allocation and their impact on parallel efficiency of …
View article: Comparison of serial and parallel simulations of a corridor fire using FDS
Comparison of serial and parallel simulations of a corridor fire using FDS Open
Current fire simulators allow to model the course of fire in large areas and its impact on structure and equipment. This paper deals with a comparison of serial and parallel calculations of simulation of a corridor fire by the FDS (Fire Dy…
View article: Impact of Vehicles on Smoke Spread Dynamics in the Case of Fire in Road Tunnel
Impact of Vehicles on Smoke Spread Dynamics in the Case of Fire in Road Tunnel Open
In this paper, the impact of vehicles in road tunnel on smoke spread in case of fire is illustrated using the FDS (Fire Dynamics Simulator) system. FDS is a CFD-based fire field model capable to simulate fire in various environments captur…