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The Carrefour Group is the second biggest large-scale distribution organization in the world, with more than 2 billion customers a year and 9,000 shops in 31 countries across 3 continents. Its turnover for the year 2000 was 64.8 billion Euros.
Carrefour built a new textiles distribution center in the Paris area. This center handles very important daily streams, with peaks that can reach up to 1.7 times the normal stream.
Activity at this particular Carrefour center has, by definition, clearly defined seasonal phases, but must also meet variations in demand that are hard to anticipate. The distribution center must be able to respond to these demands with the highest level of service possible.
In order to be able to study the way in which the center could react to any set of circumstances, Carrefour wanted to use a very detailed computer model of its center. This tool allowed:
The distribution centre is based on a very modern concept. It is highly mechanised and automated, which entails rigorous control of the streams of physical items as well as data, as the two areas are interdependent.
Interface with the modelThe model is controlled by an Excel interface.This application consists of a main screen that allows the user to control scenarios and as many scenario screens that you want to create.
Each scenario consists of about ten screens that contain the information required for performing a simulation. WITNESS writes the results dynamically to a corresponding number of Excel screens.
WITNESS reads the data from the selected scenario file. This allows you to change the data by using a simple Micosoft Excel screen. The use of Excel allows users who are not familiar with WITNESS to get to grips with the tool quickly. It is a user-friendly interface that lends itself well to experimentation. Also, the choice of Microsoft Excel makes applications of this type easier to maintain.
Although a new scenario contains several hundred items of data, it only takes a few seconds to create the scenario; most of the data stays the same.
These screens are presented as tables and show the following information:
Initial resultsThe first scenarios have enabled an understanding of the limits for accommodating incoming lorries, as well as the sensitivity of the sorting mechanism at reception to the combination of parameters such as control constraints.
When overloaded, the architecture of the sorting mechanism can result in a blockage. The dynamic visualization of this in the model generates ideas for solutions to implement as well as mistakes to avoid.
OptimizationThe objective is to study several configurations and to analyse the sensitivity of the system to certain criteria. Therefore we ran the model in WITNESS Optimizer to execute several scenarios automatically.
Some key figuresThe simulation model includes around 20,300 WITNESS elements, of which there are:
DeliverablesThe application can be installed on all versions of Windows and consists of:
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