Hydrodyn-EIASOFT

Advanced computer software program. It is an absolute user friendly system, developed specifically for environmental data creation,
calculation and analysis.

What is EIASOFT?

Hydrodyn-EIASOFT is an advanced computer software program used to simulate dispersion of pollutants emitted to the atmosphere under various meteorological conditions and complex topographical features. The software uses user defined, BFC or automatically generated computational grids for solving the basic governing equations of atmospheric flows and pollutants.

It solves the conservation equations for mass, momentum and energy for atmospheric flows and pollutants.

A chemistry module is integrated to study chemically active primary as well as secondary pollutants. It uses a 3D BFC grid to map the physical domain features to be modeled exactly and with generalized flow boundaries.

Features

• Uses a finite volume approach, which allows modeling in 2 or 3 dimensions as well as lumped parameter modeling. Any combination of lumped parameter and multidimensional noding is permitted within a single model.


• Solves equations for conservation of mass, N-S momentum and energy for atmospheric flow and pollutant.


• Solves the basic fluid mechanics equations (i.e continuity, momentum, energy, k-e & K-diffusion turbulence and photolytic set of chemical equations.


• Can do simulation of dispersion of a plume containing multiple pollutants.


• Uses 3D BFC grid, so that the simulation can be done for any arbitrary shaped topography of computational domains.


• Has its own Grid Generator, which is based on BFC methodology.


• Uses sigma-coordinate system vertically, so that irregular bottom topography of the river can be studied exactly.


• The user can select the boundary conditions at any location and select the any type of boundary conditions i.e. steady or transient.


• A graphical interface i.e. pre-processor is integrated to the model to define the required model input graphically.


• Various objects, i.e. bathymetric depth contours, islands, dykes and coastlines are represented by different colors to identify the objects easily.


• The solver has options to continue the pollutant calculations alone, after converging the flow field or both at a time.


• The monitor points can be selected at any location in the computational domain to monitor the output results and show the results graphically.


• Displays help menu whenever user required.


• It is an absolute user friendly system, developed specifically for environmental engineers, who may not have much exposure to numerical concepts in data creation , calculation and analysis.

Application Areas

Industrial and Road emissions

• Simulation of atmospheric flow around the complex shape of buildings and chemical units.
• Heavy gas dispersions in tunnels
• Leakage source
• Fire and chemical reactions
• Simulation of temperature variation

Impact evaluation

• Plumes from a single or multiple stacks along with vehicular or other industrial exhaust.
• Particulate emission from chimneys
• Chemical reactions related to plume gases
• Exhaust dispersion of vehicular traffic
• Waste water plant gases
• Analysis of different emissions, meteorological and topographical parameters on the plumes and sensitivity analysis for choosing the appropriate emission control device.

Choice of site monitoring devices

• In general pollution data monitoring devices are expensive and identifying the monitor sites physically are difficult based on the available data. Hence, AIRSOFT can be used for identifying the sites as well as calibration of concentration field.

Wind Velocity Field

• Simulation of atmospheric flow around high-rise buildings and undulated terrain
• Simulation of wind fields from data stored at meteorological stations

Urban Air Quality

• Simulation of Urban air quality
• Modules for various pollutant CO, SO2, NOx etc for traffic emission.