I am currently studying the interaction process between ice load and fixed offshore wind turbines. During the process, I have several questions that I need help with.
First of all, when I run Icemodel 3, the ice force curve I get is very abnormal no matter how I set it up. Even when I set the parameters according to the IceDyn Manual example, the results are still very strange.
It may seem unbelievable, but I’m pretty sure I choose the right icemodel.
Another thing that I am confused about is the setting of the parameters, for example, the variance of the ice thickness and the average of the ice thickness, what kind of relationship should be satisfied between these two values to be considered reasonable. Of course I know the formula between the variance and the mean, but the parameters I collected are often only the mean but not the variance, so how to set the variance bothers me. This is true for ice thickness and ice speed.
I have another question about the settings of Icemodel 3. In Icemodel 3, we need to set the mean and variance of ice speed and ice thickness to generate random ice loads, does this mean that the ice speed and ice thickness in the general settings do not work when running icemodel 3 ?
Some questions when dealing with calculation results
In my analysis of the calculation results, the output options I selected were mainly tower top acceleration（YawBrTAxp from ElastoDyn）, tower top displacement（YawBrTDxp form ElastoDyn）, and tower base shear forces（ReactFXss from SubDyn）. I wonder if you have the relevant safety norms value. What should be the limits of tower top acceleration and tower top displacement in order to comply with the specification
According to the offshore wind turbine design requirements published by IES, the design specification for ice load in Annex E should be less than 20Mpa for the support structure. According to my understanding, it corresponds to the stress at the substrure mud line, but there is no stress in the output options of SubDyn, do I need to write a pull request on GitHub?
Of course, calculated according to the shear force is also an option.
I would be grateful for any hints.