Non linear geometric

Karthic_22061

Hi,

I am doing geometric non linear analysis in Optistruct. After solving, i find .rad file created.

How is it possible? rad file being a Radioss file

Also i dont get the SPCF printed in the out file(requested SPCF in analysis ouput)

I am following units in ton,N,mm,sec... If so what should be the DTI_Units Uston,N,mm,sec or kg, N,mm,sec.

 

*** WARNING # 4188
 Units defined on DTI,UNITS card are not consistent, mass unit is ignored,
 only force/length/time units are considered in NLGEOM, IMPDYN
 and EXPDYN subcases, mass unit is derived by other three units.    

 

Altair Forum User

Hi @Karthic,

 

OptiSrtuct NLGEOM uses RADIOSS in the background ( we call it as bulk 2 block conversion).

 

NLGEOM does not convert SPCF you need to add in .rad files (REACX, REACY, ...),

 

You can use SI unit when having N, mm, sec. 

Karthic_22061

Hi Prakash,

Thank you for the quick reply

Altair Forum User

HI PRAKASH

 

I want request force as a ouput but i didnt find this option anywhere. So please tell where can i find this in hypermesh 14

 

Altair Forum User

Hi @ajaykumar

 

Are you interested in reaction forces? 

 

What type of analysis are you running?

Altair Forum User

yes prakash,

 

I am applying  concentrated with force vs time curve for that i need to know whether full load is applied or not.

 

Regards

Ajay

Altair Forum User

Hi Ajay,

 

Please include OLOAD card from global output request

Altair Forum User

Yes prakash it is in optistruct but i need in radioss  solver ..

Altair Forum User

Ajay,

 

Add /ANIM/VECT/FEXT keyword in engine file,  which writes external force to h3d file. 

Altair Forum User

Hi prakash,

 

Can we do normal model  analysis radioss. If means what is the option (to select the eigen modes request in this solver)