Learning Forum

[Matteo Lafon]

Hello everyone !

 

I am currently working on modeling flutter behavior of an airfoil. I have created a 3D model of the airfoil with 1 element thickness. To simulate pitch and plunge motions, I am employing springs in Transient Mechanical. I have successfully implemented two springs positioned near the Center of Mass. Additionally, I applied remote displacement to constrain only the Y component and Z rotation.

During the simulation in Ansys Mechanical, I encountered some warnings :

 

-One or more MPC or Lagrange Multiplier formulation-based contact regions or remote boundary conditions may have conflicts with other applied boundary conditions or other contact or symmetry regions. This may reduce solution accuracy. For MPC based remote points, setting the relaxation method may help eliminate overconstraint. Tip: You may graphically display FE Connections from the Solution Information Object for non-cyclic analysis. Refer to Troubleshooting in the Help System for more details.

 

-Not enough constraints appear to be applied to prevent rigid body motion.  This may lead to solution warnings or errors.  Check results carefully.

 

-Two or more remote boundary conditions are sharing a common face, edge, or vertex.   This behavior can cause solver overconstraint and is not recommended, please check results carefully.  You may select the offending object and/or geometry via RMB on this warning in the Messages window.

 

Despite setting up remote displacement, I am unsure about the specific boundary conditions issue. Could you please assist me with resolving this problem or direct me to a tutorial that covers similar simulation setups? Please find attached a scheme of the model I would like to realize.

Thank you for your help !

[Ashish Khemka]

Hello,

Please see if the following link helps you: How to measure the roll and pitch angles of a body (referenced to a fixed ground coordinate system) for all time steps? - Ansys Knowledge

Regards,

Ashish Khemka