Harmonic analysis – Reducing computation time and disc usage

- February 8, 2021 at 10:37 am
  
  biokill
  Subscriber
  
  Hello,
  I am running a harmonic analysis on relatively big model of a building (all shell elements). I am using constant modal damping. The mesh is optimized and cant be reduced. In the model there is total number of 118284 nodes and 267954 elements.
  Modal analysis (for first 20 modes) takes around 15 minutes. Harmonic analysis (modal invironment) takes 120 minutes. The disc space usage during calculation is about 600 GB. I am suspecting that the program is calculating and storing unnecessary things like stress and strain. I only need to calculate 2 accelerations (x,y) FRF in a single point.
  1) In the Modal analysis setting - can I turn off the marked outputs, since all I need for Harmonic analysis are mode shapes and eigenfrequencies:
- February 8, 2021 at 12:23 pm
  
  Ashish Khemka
  Ansys Employee
  
  nnYes, the options above will help you. For the Nodal Forces - Constrained Nodes. This option writes nodal forces for constrained nodes only. It is available for a Modal Analysis as well as Mode-Superposition (MSUP) Harmonic Response and Transient analyses that are linked to a Modal Analysis with the Expand Results From option set to the Modal Solution. This option directs Mechanical to use only the constrained nodes when calculating reaction forces and moments. The advantage is a reduced results file size.nnFor more details on the Output Controls please refer to the link below:nnnRegards,nAshish Khemkan
- February 10, 2021 at 8:29 pm
  
  biokill
  Subscriber
  
  Thank you!n

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