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LS DYNA BIRD STRIKE SIMULATION

Submitted by Riccardo Sgobbo on

Hello everyone!

I'm a Mechanical Engineer performing a Bird Strike simulation on a Radome using ANSYS LS DYNA.

I'm using ALE Formulation to simulate this but after some minutes of processing, the program says :

- impossible find file batch ansyslsdynaz.bat

- Error for invalid volume on "n" redo cycle

 And some nodes have x, y and z velocity as NaN.

Can anyone help me?

Thanks

 

UEL

Submitted by soham on

Dear Friends,

I have written a UEL for Strain Gradient Plasticity and is working well when i give Boundary condition as Concentrated force, But when i apply displacement boundary condition the it leads to 'system error 144'.

Iknow that system error 144 corresponds to division by zero or infinity, but then why it is coming in on displacement boundary condition is i am worried about.

I will be extremely helpful to anybody for any type of help on above problem.

Thanking you in advance

Soham