Visualization is often employed as part of the simulation science pipeline. It is the window through which scientists examine their data for deriving new science, and the lens used to view modeling and discretization interactions within their simulations. We advocate that, as a component of the simulation science pipeline, visualization itself must be explicitly considered as part of the Validation and Verification (V&V) process. But what does this mean in a research area that has two "disciplinary" homes - "flow visualization" within the computer science / computational science visualization area and "visualization of flow" within the aeronautics community. Are aeronautics practitioners merely making use of algorithms developed within the visualization community that have now become "standard" through their incorporation into various visualization tools, or rather does one find both development of algorithms and their usage for studying fundamental and engineering fluid mechanics in both communities, with possibly different focus. By narrowing the distance between research and development, and use of visualization techniques, one is left with a fertile ground for insights, and for increasing the reliability of results through V&V. In this paper, we explore "flow visualization" from the perspective of the visualization community and "visualization of flow" from the perspective of the aeronautics community in an attempt to understand how both communities can interact synergistically to bring visualization into the simulation science pipeline. We provide a brief review of the state-of-the-art in flow visualization from the perspective of both communities, discuss advances in research areas such as color maps/perception and uncertainty visualization about which the AIAA community should be aware, provide some observations from both perspectives on visualizations currently published in two of the communities' representative journals (IEEE TVCG and AIAA Journal), and then conclude by highlighting some areas of possible synergistic interaction that might benefit both communities.