🎉Community Raffle - Win $25

An exclusive raffle opportunity for active members like you! Complete your profile, answer questions and get your first accepted badge to enter the raffle.
Join and Win

Problem with Large displacements simulation

User: "Piercarlo Marchegiani"
Altair Community Member
Updated by Piercarlo Marchegiani

Hello!! 

I am triying to simulate a wing model with the large displacements card activated.  

The model worked well with the loadstep type "Generic". 

To make this simulation, first I switched to "Non-linear Quasi-static" analysis type.

Then I created a NLPARM load collector and added it to the loadstep in NLPARM(LGDISP) option. 

 

The problem is that when I start the simulation, the Nonl_EUI_st, Err_EPI_st and Meas_EWI_st values does not change so the simulation does not converge and I get the error #4965 --> Maximum number of time increment cutbacks reached. 

I have tried to use the NLADAPT card, changing the NCUTS option, and changing the  NINC and the MAXITER in the NLPARM load, and nothing works. 
 
I have also tried to put the NLPARM card without large displacements and it went well, so the non-linear quasi-static option is okay, the problem is only with large displacements option.

I even made a simplier model and the simulation went well!! So I dont know what is the problem with this file.  

Thank you for your help!!

Find more posts tagged with