Hi Good Afternoon,

                                I am a beginner of Abaqus, i have modeled a bird impact on fan blades. The problem description follows like this

Fan is rotating with some velocity and bird is hitting to blades.

Bird has been modeled with SPH concept, where the input file has been edited using text editor for replacing the sections. (i have done this by seeing the video of SPH tutorials in this website).

Material properties of Bird is given to Density, Plasticity, shear modulus & EoS> Us-Up> C0-19500m/s, S-1, Gamma0-1

For Bird ,Step- initial-mechanical> velocity> V1= 19500 m/s, time period for step is 1.

Interactions, Step>Impact>Surface-to-Surface (Explicit), Surfaces1- Bird, Surfaces2- 6 fan blades, Intprop- Normal>Hard Contact

So when i run the analysis the blade was rotating and bird was moving but  not hitting the blades in results file

So i made changes to Time period from 1 to 1.5 and in assembly gap between fan and blade reduced so that the bird can hit blades.

The problem i am facing when i changed Time period 1 to 1.5 and i reduced the gap between fan and bird in assembly is.

When i create job and run the analysis i get the problem of " The maximum ratio of deformation speed to wave speed is 0.36440 in element 200 of instance BIRD-1 at increment 8."

Please correct me where i am doing wrong and thanking you all in advance.