Dr. Avinash Vaidheeswaran presented the ongoing efforts in developing the Verification, Validation and Uncertainty Quantification (VVUQ) roadmap at the ASME Verification and Validation Symposium held at Las Vegas in May, 2017. In his talk, he presented key extensions to ASME guidelines to overcome the inherent complexities in multiphase flow applications. The work is a collaboration between NETL and Alpemi Consulting LLC. The abstract is given below:
A roadmap for validation and uncertainty quantification of multiphase flows is proposed. This work builds upon the ASME standards (ASME Guide for Verification and Validation in Computational Solid Mechanics, V&V10-2006), to address the lack of a systematic validation process for multiphase flows. The procedure being developed takes into account both experimentation and computational models. The experiments are specifically designed for validation of the multiphase computational fluid dynamics (CFD) suite, Multiphase Flow with Interphase Exchanges, MFIX. A bench top hopper for granular bulk-solid discharge is used to demonstrate the proposed procedure. Control variables, response variables, and physical constraints are identified for both experiments and simulations through surveying subject matter experts. Statistical design of experiment techniques are employed to specify rigorous experimental and simulation campaigns. The material properties are held-constant factors, hence all experiments are performed with high density polyethylene (HDPE) particles. The experimental control variables, orifice diameter and apex angle, largely influence the discharge flow rate. The measured angle of repose is constant since all the experiments are performed with the same material. Preliminary MFIX simulation results are in good agreement with the data on discharge flow rate, but the angle of repose is under-predicted.
