Hello Morten, thank you for your answer, I already have the two PDF. What is this Turbulence Simulator, that you have mentioned, for? I need to get wind files to insert in a different program that use these files to introduce a wind spectrum (sesam-sima), with the files that I have obtained from "windsimu", is it enougth or do I need the Turbulence Simulator? thank you again, regards.