Question

What are the two viscosity coefficients involved in the relationship between stress tensor and strain rate of fluids?

(a) Kinematic viscosity and bulk viscosity

(b) Dynamic viscosity and kinematic viscosity

(c) Dynamic viscosity and bulk viscosity

(d) Kinematic viscosity and volume viscosity

This question was posed to me during an interview for a job.

I need to ask this question from Governing Equations in chapter Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

Answer 1

Right option is (c) Dynamic viscosity and bulk viscosity

To explain: The two viscosities involved in stress train relationship of fluids is dynamic viscosity coefficient and bulk viscosity coefficient. Bulk viscosity coefficient for diagonal elements respectively.