Guidelines for reuse of multi-resolution physical models

The reuse of mathematical models of physical phenomena, here called physical models, within simulations is attractive because it has the potential of improving simulation results while reducing implementation and testing work. In practice, however, it can be complicated to reuse a model that was originally developed for other studies and applications. It becomes even more difficult when multiple stakeholders have different ideas on how to use and extend the physical model.
An attractive approach to deal with this problem is to develop and maintain a multi-resolution physical model that can be reused for different purposes. A multi-resolution model is a model that represents a system or phenomenon at different levels of fidelity simultaneously. On the process side, such an approach requires a policy for managing the use, the support and the development of the multi-resolution physical model. On the more technical side, a multi-resolution physical model requires a model specification that maintains all internal and external relationships while providing interoperability.
Focusing on the reusability of physical models, this paper presents and analyzes two examples of multi-resolution physical models from different domains and discusses how they are used in different simulations. The examples concern the modeling and use of (1) a missile model, including its different components, and (2) a signal propagation model in an underwater environment. The examples show the global approach of how multi-resolution physical models can be used. Based on the experiences of modeling and simulation experts and physical modeling experts, this paper presents our guidelines and recommendations on how to facilitate the use of multi resolution physical models in simulations. These guidelines are structured according to the different software development phases, and help to improve the reusability and utility of physical models.