  We review our recent study on the QCD static force using gradient flow at
next-to-leading order in the strong coupling. The QCD static force has the
advantage of being free of the $O(\Lambda_{\text{QCD}})$ renormalon appearing
in the static potential but suffers from poor convergence in the lattice QCD
computations. It is expected that the gradient flow formalism can improve the
convergence. Based on our next-to-leading-order calculations, we explore the
properties of the static force for arbitrary flow time $t$, as well as in the
limit $t\rightarrow 0$, which may be useful for lattice QCD simulations.

High Energy Physics - Phenomenology