## Definition

Modelling is the process of imitating a real phenomenon or process with a set of mathematical formulas. In principle, any phenomena that can be reduced to mathematical data and equations can be simulated on a computer. But, as natural phenomena are subject to an almost infinite number of influences the most tricky task developing useful simulations is to determine the most important factors.

## Context

In principle, any phenomena that can be reduced to mathematical data and equations can be simulated on a computer. But, as natural phenomena are subject to an almost infinite number of influences the most tricky task while developing useful simulation programs is to determine the most essential factors.

Although mathematical modelling has made big advances, the user must have good knowledge of flow physics and high problem conscience, because the models abstract from reality and the engineer has to separate the important from the unimportant influences and estimate the main parameters so that complex physical relationships are modelled correctly.

Furthermore he must be able to interpret the results of the model calculation and recognize the implausible and the limits of the calculation.