Objective Aiming at the problem of implosion of deep-sea ceramic pressure hull in 10,000 meter water depth environment, this paper investigates the effect of different liquid-phase equations of state （EOS） on the implosion characteristics of deep-sea ceramic pressure hull.

Methods Based on the theory of compressible multiphase flow and adaptive mesh refinement （AMR）method, a numerical simulation method for implosion of deep-sea ceramic pressure hull that can use different kinds of liquid-phase equations of state is proposed, which can realize the refinement of implosion shockwave capture and accurately describe the shockwave load attenuation characteristics.

Results The type of liquid-phase equation of state has a large effect on the implosion shockwave load characteristics, the peak pressure and wave velocity of the implosion shock wave at the radius location calculated using the NASG (Noble-Abel-Stiffened-Gas) liquid-phase equation of state were 11.29% and 0.88% lower than the SG liquid-phase equation of state, respectively. The peak pressure and wave velocity of the implosion shock wave at the radius location calculated using the MNASG liquid-phase equation of state were 13.78% and 4.73% lower than the SG liquid-phase equation of state, respectively.

Conclusion The use of different liquid-phase equation of state to describe the extreme flow field environments of deep-sea implosion provides a new shockwave load reference for underwater implosion protection.