![]() ![]() However, for certain flow specifics of engineering interest, the use of flow visualisations is more relevant. Consequently, when verifying and validating numerical results, literature focuses on the comparison of values and non-dimensional numbers, together with uncertainties (experimental, iterative, discretisation and statistical ). ![]() It is often argued that these figures add little in terms of quantifiable knowledge about the flow, rather they help both the researcher and reader to intuitively understand it. ![]() In the context of computational fluid dynamics (CFD), next to the more simple line graphs, the use of 2D and 3D figures to visualise computed flows has become common since the widespread availability of suitable computational and graphical hardware. The first scientific visualisations were made hundreds of years ago, such as the figures made by Leonardo da Vinci, and figures are widespread in modern papers, as reviewed in. Nevertheless, visualisations are still at the core of reporting scientific results. Using these examples the benefits of ray tracing are shown, and it is concluded that ray tracing can improve the reliability of scientific visual comparisons. Several visualisation problems which can be overcome through application of this methodology are discussed, and the use of ray tracing is exemplified for several common test cases in the maritime field. In this work, we argue that the use of ray tracing software can help make comparisons between computational and experimental fluid dynamics more robust and meaningful, and that, in some cases, it is even a necessity. Usually, little attention is paid to the visualisation itself, unless when the render is used solely for its eye-catching appearance. In science, and numerical fluid mechanics in particular, visual inspections still play a key role in both understanding flows, predicted by computational fluid dynamics, exhibiting features observable in real-life, such as interfaces or smoke, and when comparing such flows against experimental observations. Increased graphical capabilities of contemporary computer hardware make ray tracing possible for a much wider range of applications. ![]()
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