![]() Some variable data are defined in a slightly different way. Then, each time the drag coefficient is needed, OrcaFlex will first calculate the Reynolds number $x$ and then derive and use the corresponding drag coefficient $y(x)$. But sometimes the Reynolds number dependency is important, in which case you may specify the drag coefficient to be a function of Reynolds number. ![]() For many applications this variation is not significant, so a constant drag coefficient is sufficient. In the real world this is not a fixed constant value – it depends on the Reynolds number. If $x$ varies during the simulation then $y$ varies accordingly.Īs an example, consider the drag coefficient of a line. Typically the data item's value $y$ is then specified as being a function of some other quantity $x$, and the actual value $y(x)$ used by OrcaFlex then depends on the value of $x$ at the time. But for some numerical data items you can choose to instead specify variable data. a value, $y$ say, is a fixed specified value.
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