Question: Coursework Question A Production Semisubmersible Is Floating At 120 M Above The Seabed (Figure 1). The Platform Operates In Wave Condition Whose Significant Wave Height Is [A] M,peak Period Is [B]s And A Current Velocity Of (C) M/s. The Offset Of The Riser And Platform In The Horizontal Direction Due To Rough Weather Is 3 Min 150 S. Determine: 1. The …
Transcribed Image Text from this Question
Coursework Question A production semisubmersible is floating at 120 m above the seabed (Figure 1). The platform operates in wave condition whose significant wave height is [A] m,peak period is [B]s and a current velocity of (C) m/s. The offset of the riser and platform in the horizontal direction due to rough weather is 3 min 150 s. Determine: 1. The Frequency (w), Wavelength (), Wave number (k) and Wave speed (c). [10 Marks] ii. Determine the water depth condition in which the platform operates and with justification, select the most appropriate wave theory for the design of the platform. [20 Marks] For the given water depth and using appropriate wave theory and Morison’s equations, calculate the wave particle horizontal and vertical velocities and acceleration across the length of the riser and predict the dynamic pressure, inertia and drag forces across the length of the riser (at interval of Sm) whose diameter is [D]m. (50 Marks] iv. Plot the loading profiles (dynamic pressure, inertia, drag and total load) on the riser. [20 Marks)
