Author(s): Mohamed Ghidaoui
Linked Author(s): Mohamed S. Ghidaoui
Keywords: Transient Flows Modelling
Abstract:
As this is the inaugural course of the new IAHR education initiative, I will use the first five minutes of the talk to introduce this initiative and provide a preview of the upcoming courses for the rest of 2025. I will then dedicate the remainder of the talk to addressing the following five questions. (1) This course will expose you to a wide a range of models from very simple 1-D models to 3-D models. What are the length and time scales that define the set of transient flow regimes and the domain of applicability of the various models? (2) This course deals with problems where Mach number << 1 and the majority (if not all) of the speakers will include compressibility in their models. Yet, many books and papers deny the role of compressibility in flows where Mach number << 1. In fact, a reviewer of research proposal recently stated “Mach number is between 0 and 0.0025 which is basically an incompressible fluid flow”! So, when is it necessary to include compressibility in our models and what criteria decides if compressibility is or is not important? (3) All inverse transient flow models are ill-posed; yet inverse transient models are routinely applied to infer model parameter estimation and perform defect detection with no apparent fuss. How come? (4) It is evident that incorporating physics in the development of data driven transient flow models is beneficial. But what physics to incorporate? (5) Models often agree well with laboratory data. What do we need to do to achieve similar level of agreement between models and field data?
Year: 2025