Velocity came out one sixth at τ=0.6 — dropping the half-force F/2 from Guo forcing
·5 min read
Keep the Guo source term but drop F/2 from the LBM velocity and the effective body force shrinks by (1−1/2τ). On Kolmogorov flow at τ=0.6 the amplitude is 0.166 of exact.
Where Half the Force Goes in LBM — Four Forcing Schemes and 1−1/(2τ)
·10 min read
Steady Poiseuille gives the same error for five LBM forcing schemes. At τ=0.6, the half-shift alone inflates the amplitude by a factor of 1.83.