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SESS3023 MARINE HYDRODYNAMICS
ASSIGNMENT 2 – SEAKEEPING REPORT
Description:
You are tasked with performing the seakeeping analysis of the SINTEF ship model (full-scale)
available in the Blackboard folder. See the appendix for the ship particulars.
Service conditions:
You will be required to conduct the seakeeping analysis at two Froude numbers: 0.176 (15
knots) and 0.199 (17 knots).
Seaway:
For the irregular sea analysis, select the ITTC spectrum (a two-parameter spectrum) in Maxsurf
Motions, using the sea state data provided in the table below. Focus your analysis on Sea States
4 and 5 only. Refer to the criteria below to determine your assigned sea area from those listed
in the table.
Student registration number ending 0, 1, 2, or 3: Black Sea
Student registration number ending 4, 5, or 6: Mediterranean Sea
Student registration number ending 7, 8, or 9: Aegean Sea
Seakeeping Criteria
To evaluate the performance of your design, you are required to check whether your design
adheres to the following criteria:
RMS heave acceleration < 0.2g RMS roll amplitude < 3° RMS pitch amplitude < 2° Report 1) Produce a report, containing an introduction in which you must explain the importance of seakeeping performance analysis for a ship. This introduction should ideally be around 300 words. You may give references to reports or scientific publications. You may subdivide the report into sections, but the overall structure of your submission should read as a continuous text. That is, you should not write point-by-point answers to the questions below. 2) Regular waves: Calculate the heave, pitch and roll responses of your ship to regular waves for varying frequencies (as defined by default by the software) at the two different speeds mentioned above. Select the wave headings varying from 0° to 180° with 30° increment. Present your results as RAOs versus wave frequencies. Briefly discuss your results. Comment on the resonant frequencies for each of the three motions and how they are affected by a change in speed. Comments on the parameters affecting a typical RAO curve. If you were to conduct seakeeping experiments with the same ship model in regular waves in our towing tank, would you expect any discrepancies between the numerical and experimental results If so, where would the discrepancies stem from 3) Irregular waves: Calculate the heave, pitch and roll RMS displacements in the irregular sea states given above (for the specified sea states) at two different speeds. Your analysis should be conducted for heading angles varying from 0° to 180° with 30° increment. You can present your results in polar diagrams. Additionally, investigate whether any of the seakeeping criteria are violated for any speeds and wave headings (for each of the sea states assigned to you above). Present a critical discussion of your results. When discussing your results, also consider the following questions: If you were asked to conduct an irregular sea analysis in sea state 6 and 7, would the results from 2-D linear theory be accurate and why (please do not conduct analyses in sea states 6 and 7, this is a hypothetical question) Briefly discuss the limitations of the seakeeping theory used in Maxsurf and comment on how to improve the accuracy. Marking breakdown: Category Weighting Accuracy of results/calculations (use of the software package, performance of calculations, and analysis of the results, as requested) 40% Critical discussion of the results and demonstration of your understanding (including how you have responded to the questions given under the Report section) 40% Introduction section + technical writing 10% Presentation of the report (structure and tidiness of the report) 10% This coursework will form 15% of your module mark. Deadline: The deadline for this coursework is 10 pm on Thursday 14th May 2026. Word limit: Your report should not exceed 1200 words. If you exceed the word limit, you will be penalised by 5% for each 250 words that you’ve exceeded the limit. Please state your word count on the cover page of each report. The references list (if any) is not included in the word limit. This is an individual assignment. Your report must be your own work and should demonstrate your own understanding. GenAI Assessment Setter: Tier 2. Assistive use Students may use GenAI to help achieve intended learning outcomes, which are still achievable without GenAI use. Please refer to the Specification Table. Students must complete a declaration form. Please submit your declaration forms separately from your report using a specific submission portal on Blackboard. Appendix