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We comment on the paper by M. S\'ykora, M. Pavelka, M. La Mantia, D. Jou, andM. Grmela "On the relations between large-scale models of superfluid helium-4,"Physics of Fluids, 33(12):127124(2021), where the authors have developed aformalism for describing a coarse-grained flow of superfluid helium. Thisformalism is greatly based on the Hall-Vinen-Bekarevich-Khalatnikov (HVBK)model. We strongly disagree with the use of the HVBK equation approach for thecase of the three-dimensional quantum turbulence and expose our objections inthis comment. We discuss the HVBK method and also criticize the so-calledvortex bundles model, which serves as a basis for using the HVBK method in athree-dimensional quantum turbulence.

Comment on "On the relations between large-scale models of superfluid helium-4" [Phys. Fluids 33, 127124 (2021]"