Help, i get an error I don't understand

So im trying to cfd simulate a boat in a body of water. for that i created my cad model of my boat and added a flow region in cad edit mode. now i get this error when simulating A setup with 2 regions is being used in a single-region analysis type. Please make sure that all regions except for one have an Advanced Concept assigned to them. i do not understand what it means, ive gone through forums for hours now and i just dont understand what i need to do. also does the material of my boat matter? im asking bcs i can only choose between fluids when assigning materials.
thanks for your help

Hi @pleupold,

Thanks for posting your question!
This error means that you are trying to simulate a flow using solid bodies in the model, which is not possible. To simulate a flow around something, you need to get the negative portion of the geometry (representing the space where the air flows through). To know more about it, please take a look at this page:

I also recommend you to search for boat simulations in our public library to use as a guide :slight_smile: