CFD for Sailing Yacht Design | Structural Response
|
Structural analysis and design is indispensable for the endurance of yachts under rough sea and wind conditions. While safety is generally the primary concern, material and inherent weight savings can be important factors for both mass produced and competitive vessels. Minimizing structural component complexity and usage can also merit luxury yachts in the availability of extra usable space. |
 |
| Capsize due to Keel Failure | |
 |
CAEbridge, in collaboration with the University of Pisa, is developing an efficient process to evaluate the structural response of a 32 foot sailing hull to aero/hydrodynamic loads. The simulation geometry includes the hull along with its appendages such as the rudder, the keel and the bulb, which all have hydrodynamic load impacts. The mast and the sails are excluded as they constitute aerodynamic loads which will be tackled in a future study. Our long term goal is to automate the coupling between flow and structural solvers and offer the industry a complete black box type solution. |
| CAEbridge, 32ft Yacht Model | |
|
Our initial simulations evaluate the flow dynamics around the fixed trim vessel at 5 degree heel in running condition. The unsteady wake and inherent pressure distribution data is collected over 4 seconds until the transients die. By defining the geometry as an assembly of individual components, we are able to collect flow data on the appendages separately. This way the loads affecting the internal structure can be conveniently separated. |
|
 |
 |
|
Wake evolution of Impulsively Started Hull |
|
|
In the next step, the CFD pressure results are mapped onto the structural mesh and input to the FEA solver as a load distribution. In addition, point loads estimated for the rig assembly are also integrated in the model. The FEA solution provides the structural stresses and deformations over the entire hull skin and the connected internal members. |
|
  |
|
| Finite Element Analysis Solution for Hull Skin and Cross Members | |
|
More advanced studies integrating a dyanmic trim condition under wave conditions is in progress to assess the stress levels due to slamming. Ultimately, the rig will also be included in the geometry to have the complete vessel evaluated both hydro and aerodynamically. This type of analysis helps to optimize the positioning and shape of the structural members as well as to identify zones to be reinforced over the hull skin. |
|
