Question

What is the relationship between bulk viscosity coefficient (λ) and the dynamic viscosity coefficient (μ)?

(a) λ=\(-\frac{2}{3}\) μ

(b) λ=\(\frac{2}{3}\) μ

(c) λ=\(-\frac{1}{3}\) μ

(d) λ=\(-\frac{1}{2}\) μ

I got this question during a job interview.

I want to ask this question from Governing Equations topic in division Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

Answer 1

Right option is (a) λ=\(-\frac{2}{3}\) μ

Easy explanation: The bulk viscosity coefficient represents fluid compressibility effects. λ=\(-\frac{2}{3}\) μ is the relationship between the bulk viscosity coefficient and the dynamic viscosity coefficient.