Caterpillar Inc Vpd, Cfd, Python Scripting Interview Questions and Answers

Convergence in CFD analysis is measured by checking if the solution is not changing significantly with each iteration.

• Convergence is typically measured by monitoring residuals of key variables (e.g. velocity, pressure) over iterations. When residuals reach a small, acceptable value, convergence is achieved.

• Another method is to track the change in key parameters (e.g. mass flow rate, drag coefficient) between iterations...read more

Experience with PowerFlow and ANSYS

• I have extensive experience using PowerFlow for fluid dynamics simulations

• I am proficient in using ANSYS for structural analysis and thermal simulations

• I have successfully integrated PowerFlow and ANSYS for multiphysics simulations

• I have worked on projects where accurate CFD analysis was crucial for design optimization

CFL number is a dimensionless number used in fluid dynamics to determine the stability of a numerical simulation.

• CFL number stands for Courant-Friedrichs-Lewy number.

• It is calculated as the product of the flow velocity, time step, and grid spacing, divided by the fluid kinematic viscosity.

• A CFL number greater than 1 indicates that the simulation is unstable and may lead to inaccurate results.

• A CFL number less than 1 en

RAN, LES, and DNS are different approaches used in computational fluid dynamics (CFD) to model turbulent flows.

• RAN (Reynolds-Averaged Navier-Stokes) models average the flow properties over time, suitable for industrial applications.

• LES (Large Eddy Simulation) resolves large turbulent structures while modeling smaller ones, suitable for complex flows.

• DNS (Direct Numerical Simulation) solves all scales of turbulence with...read more