VLE or Virtual Environment Laboratory, is a handy, easy to use multimodeling, simulation platform developed on the discrete event formalism DEVS (Discrete Event System Specification).
VLE provides a set of C++ libraries, the VFL (VLE Foundation Libraries) and a lot of programs like a simulator, a graphical user interface to model and develop models and tools to analyze and visualize simulation outputs.
The VFL are sufficiently well designed to allow the development of new simulators, models or new programs for modeling and analysis.
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VLE Source Code:
In VLE, models are conceptualized in a specification language which is similar to an UML Model. A Model can contain several components, including actions, sub-models, compartments, inputs and outputs.
Components can be coupled to each other and are interconnected by means of State Transitions.
The VLE enables you to implement different types of simulations:
Event-Driven Models Event driven Simulations contain at least one event represented by an event which can trigger other events.
Continuous Modeling A continuous simulation involves the concept of a state that can remain constant or change.
Discrete Modeling Discrete Simulations are made up of events which are triggered at certain instances in time.
In addition to the modeling capabilities, the VLE is based on a virtual environment consisting of several compartments which are implemented as a simulation grid.
Within the simulations, there are several predefined model simulations like interaction simulations, biochemical simulations, chemical process simulation, etc.
The VLE documentation also contains information about the VFL.
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Virtual Environment Laboratory (VLE) is a software environment, developed by RUM Consultancy, which provides the user with simulators and a complete modeling environment.
It is possible to simulate, in a real-time mode or at a speed very close to the real mode, user defined or models.
What is VLE?
VLE is a software environment for the realization and model of the real world situations. It can be considered as a simulation software which has the VLE Foundation Libraries as its best and the simulators and the analysis tools as its best components.
We will give to VLE, as to any simulators but with the advantage of the selection of the used programming language, VLE is the most simple, easiest and straightforward modeling and simulation environment to get introduced in the field of the software simulation.
The main feature of VLE is to model a real world situation in a software environment.
It is not an actual real time simulation; instead it is a simulator that works, using discrete events formalism, in a quasi-real time (close to the real-time model).
VLE can be used in the cases of modeling and simulating real conditions. It is possible to simulate a person’s action and reaction in a specific situation, which will give you the possibility to select a predefined behavior. It is possible to model, for example, a person’s actions and reactions to detect anomalies in the behavior of the user.
VLE can model several situations at the same time, to implement, for example, the process of a shopping in a mall or a city.
The simulation environment allows you, with the use of the best VLE programming language, to write a series of programs to discover, discover, analyze and study the effects and effects of the behavior of the system, taking care of important aspects such as time, human behavior and the effects of other systems that can interfere in the behavior of the human one.
VLE can be used as a complete system or as a “part” of a complete system.
What can VLE be used for?
VLE is a multipurpose environment.
It allows us to model and to simulate several situations at the same time.
It is very easy to build complex models.
It is possible to write a program in different languages to analyze and simulate the flow of information in a system.
VLE can be used as a solution for several problems:
– To develop programs that can simulate real world
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VLE is a discrete event formalism (DEVS) simulator for chemical engineering systems (VLE stands for Virtual Laboratory Environment). It is a set of C++ libraries and a graphical user interface to model and to develop DEVS models. It allows performing, simulating and analyzing different types of models (e.g. discrete event, continuous, dynamic, mixed etc.).
Besides the VLE simulation engine, VLE contains also a set of tools to analyze, visualize and to support the modeling activities.
VLE is a generic and open source software. It is under the GPL v2.0 license.
In this blog post I will present you a small tutorial to use the VLE library and a couple of concrete examples.
This tutorial is not meant to present a complete tutorial. If you want something more advanced, please read the VLE documentation. It presents a lot of examples and documentation.
For what I am going to present here, I invite you to install the VLE environment in your local machine.
To install VLE, you need a recent version of the Windows environment. (e.g. Windows 7, 8, 10 etc.).
For this tutorial I am going to use a dual core CPU with 8 GB of RAM. I recommend 32 GB of memory for the simulations. If you have higher requirements, you can start with 64 GB of memory, but in this case, VLE will take a lot of time to start.
Then, download and install the latest release of VLE.
The libraries are implemented in C++. To test the installation, you can make compile your first model or simulator with the vlestim.exe (you can find it in the folder vle\bin\vledit.
I am going to present an example to run the VLE simulator in a graphical interface.
The graphical interface is based on Qt framework which is a cross-platform C++ application framework. It has been widely used for desktop application.
You will need a modern version of Qt to make the graphical interface.
In the folder vle\bin, you will find the executable vlestim.exe. To run this executable, type the following command on the command line:
After a few seconds, you will see in the vle\log directory the log file vlestim.log.
vlestim is VLE specific simulator.
In the next example, we will run the vlestim.exe.
What’s New in the?
The description of a VLE is in itself a big subject and a lot of documentation could be written about this topic.
The goal of the VLE is to increase the flexibility and accessibility of the
DEVS formalism in a very easy, straightforward, intuitive and user friendly
way. In the VLE environment it is possible to write any kind of
The VLE provides a mechanism to automatically convert such a model into a
DEVS package and to add functionalities such as a graphical user interface
(GUI), simulation tool or a simulator.
It is possible to develop new DEVS packages that can be later reused and
published as independent packages.
VLE is based on the DEVS specification, itself based on the Event-driven
Analysis and Design Specification (EDAS) and already supports several
The goal of VLE is to be an extension of this platform that supports the DEVS and VFL
specification as well as the VLE API that is documented in the VLE
VLE Modeling Language
For the modeling language the VLE offers a programming language for writing models in a visual modeling language.
The model written in VLEML is a sequence of event triggers, called actions.
When a model is made, the C++ based compiler creates a DEVS package. The package includes all the models, and also the simulation framework supporting a number of visualization tools.
The model built with the VLE is a visual language that is easy to understand and can be easily read and understood by others.
High level model:
System Requirements For VLE – Virtual Laboratory Environment:
Gfx card: 1GB DDR3
CPU: Intel® Core2 Duo Processor E4300 or AMD Phenom X3 Processor 945 or similar
Memory: 2GB RAM
Video card: Nvidia GeForce 6800 GT or ATI Radeon HD 2600XT or similar
Sound: DirectX-compatible sound card
System: Windows Vista/7/8/8.1/10 64-bit OS (32-bit OS compatible but not supported)