“Since I realised my erroneous faith in numeri- cal methods in the early nineties, I have been involved in a number of model tests.”
Are research institutes set to play a role? So what role does Mr Haver see for research institutes in this field of extreme waves and platform response? Funnily enough, he admits, he used to be quite sceptical.
After finishing a PhD in 1980, he started working at the Norwegian Hydrodynamic Laboratories (now Marintek). “At that time I believed that model testing was a dying sort of activity and I did not like the idea of doing model tests.” He even pointed out in his interview that he would prefer not to be involved in model testing, although he was applying for a job at a ship model basin! Despite this, he got the job and worked there for three years (but without doing any model testing).
“Nearly 30 years later I see how wrong I was. Since I realised my erroneous faith in numerical methods in the early nineties, I have been involved in a number of model tests.”
Mr Haver comments: “My contribution in that respect, I think, is to advocate the
importance of doing many repetitions with different random seeds of each sea state, in order to capture inherent randomness properly.” This is particularly important when dealing with strongly non-linear response problems - in particular if an on-off mechanism is involved, he adds.
Model testing is more important than ever, stresses Mr Haver. “As we are doing designs for more and more complex structures and also aim for accurate predictions of extremes using sophisticated computer programs, we can not trust our predictions before the tool is validated by model testing.
“Some structural problems are - and I guess will be for a foreseeable future - too compli- cated for numerical methods. In such cases we need to be able to obtain loads/re- sponses to be used for design directly from model testing.”
In the future, Mr Haver believes that research institutions will be given more and more assignments that require both model test- ing and the use of computer tools in order to deliver what the customer requires.
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