Week 1a: Introduction to CFD Questions With Complete Solutions

What is CFD? How does CFD work? correct answer: computational fluid dynamics: a set of numerical methods applied to obtain approximate solutions of problems of fluid dynamics and heat transfer. How it Works: - The flow is broken down (discretized) into elements that make up the mesh of the fluid domain Compare and contrast FEA and CFD. correct answer: Finite Element Analysis (FEA): - Model the solid domain (i.e. model the solid itself) - Ex. Model pipe and stress on the pipe Computational Fluid Dynamics (CFD): - Model the fluid domain (i.e. model the fluid surrounding or inside the solid, not the solid itself) - Ex. Model fluid inside the pipe, and not the pipe itself What are the 3 methods that can be used to solve fluid problems? correct answer: 1. Analytically - Theoretical equations 2. Experimentally - Replicate the problem and test it 3. Computationally - CFD Define the analytical solutions method to solving fluid problems. What are the advantages and disadvantages of using analytical solutions to solve fluid problems? correct answer: as the name implies: arriving to conclusions based on theoretical considerations - Ex. using conservation of mass and conservation of momentum to solve for the velocity of a fluid flowing through a pipe