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We present the VECMA toolkit (VECMAtk), a flexible software environment forsingle and multiscale simulations that introduces directly applicable andreusable procedures for verification, validation (V&V), sensitivity analysis(SA) and uncertainty quantification (UQ). It enables users to verify keyaspects of their applications, systematically compare and validate thesimulation outputs against observational or benchmark data, and run simulationsconveniently on any platform from the desktop to current multi-petascalecomputers. In this sequel to our paper on VECMAtk which we presented last year,we focus on a range of functional and performance improvements that we haveintroduced, cover newly introduced components, and applications examples fromseven different domains such as conflict modelling and environmental sciences.We also present several implemented patterns for UQ/SA and V&V, and guide thereader through one example concerning COVID-19 modelling in detail.

philosophical transactions - royal society. mathematical, physical and engineering sciences/philosophical transactions - royal society. mathematical, physical and engineering sciences

VECMAtk: A Scalable Verification, Validation and Uncertainty Quantification Toolkit for Scientific Simulations