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Showing posts from July, 2018

Modal Submodeling

This post was inspired by CAEAI's blog post on modal analysis sub-modeling and an XANSYS question. Their instructions were not explicit and everything was done in Ansys Classic. The goal here is to show modal submodeling in Ansys Workbench. Here's a walk through of an example:

Step 1
Solve the coarse model Modal Analysis (System A).
Fig 1: Coarse Model Modal Analysis (System A)
Step 2
Create a finely meshed submodel Harmonic Response Model (System B). This will be the submodel.
Fig 2: Project Schematic
After creating the desired mesh, add a named selection at the cut boundaries called cut_face. Add the following command snippet in the Setup branch.

!! Creates cut boundary NODE file
! WB will complain but boundarynodes.node file should be created
/prep7
cmsel, s, cut_face
nwrite, boundarynodes, node
finish
/exit

The above step writes out a file listing the nodes and their coordinates which will be used for interpolation. After solving for the model, Ansys Workbench will flash a lot of e…

Ansys Student in the Cloud

Cloud Computing*?
Cloud computing is all the rage now for good reason. It is tempting to own a low cost computer and remote-desktop to a supercomputer. One could, in theory, run Ansys on Chromebook with internet connection by connecting to a Cloud Computing Providers Virtual Machine. I took a quick look and have the following to report.

Setting Up Windows Virtual Machine (VM) : Quick Start
Google Compute: YouTube 
Micosoft Azure: YouTube1 & YouTube2

Patience is key. After starting up the Virtual Machine for the first time, one has to wait a bit (15 minutes?) before the virtual machine really starts for one to remote login. I fiddled around with the "source IP ranges", setting it to 0.0.0.0 and even my own IP address. It was unclear if that was useful or waiting alone did the trick.

Once logged in, one has to override the strict security set by the Internet Explorer to allow download of the free Ansys Student.

Finally, remember to Shut Down from the remote desktop and &quo…