Steam　direct　contact　condensation　has　been　widely　applied　in　many　fields　because　of　its　high　heat　and　mass　transfer　efficiency.　However,　this　process　may　cause　damage　to　related　devices　due　to　its　pressure　oscillation,　especially　under　ocean　condition.　The　axial　and　radial　components　of　the　additional　force　and　buoyancy　force　were　analyzed　in　this　numerical　study.　Results　indicated　that　the　Coriolis　force　played　a　more　important　role　than　other　forces.　The　effects　of　rolling　period　and　rolling　angle　on　the　dominant　oscillation　frequency　were　investigated.　Under　rolling　condition,　as　the　rolling　period　decreased　and　the　rolling　angle　increased,　the　dominant　oscillation　frequency　of　steam　submerged　jet　increased　because　of　the　enhanced　Coriolis　force,　which　promoted　the　necking　of　the　bubble.　Moreover,　a　correlation　was　proposed　to　predict　the　dominant　oscillation　frequency　of　steam　submerged　jet　under　rolling　condition.　The　maximum　deviation　was　less　than　±　9.5%.　©　2022　Elsevier　Ltd