NairnFEAMPM

NairnFEAMPM is a Mac-only application that contains all the bundled code engines you need to run finite element analysis (FEA) and material point method (MPM) calculations without needing any additional installations (i.e., no need to download and build source code or to install third-party libraries).

Introduction

The NairnFEAMPM application does FEA and MPM modeling on a MAC. NairnFEAMPM is being developed by Prof. John A. Nairn from the Wood Science and Engineering Department Oregon State University. This application is free but it is a dynamic work in progress as part of an active research program. This application is Mac only. If you are not using a Mac, you can do almost the same things using the Windows application NairnFEAMPMViz.

Downloads

The application NairnFEAMPM "Universal" Mac app (i.e., runs native on either Intel or new M1 chips). Install by expanding the downloaded zip file and dragging NairnFEAMPM to your Applications folder. This application requires MacOS 10.13 (High Sierra) or newer, but is not tested much below Monterrey (12.x).

NairnFEAMPM Download	Size (MB)	Updated
NairnFEAMPM 10.0 - This version is a full-featured version of NairnFEAMPM for running NairnFEA and NairnMPM complete with code engine binaries and third party libraries needed for the calculations without needing any additional installations.	8.9	24 APR 2024

Run NairnFEAMPM

Each new MacOS again tries to stop you running software unless you download it from the Mac App Store. When you first run this app outside that app store, you may get some warnings. Hopefully the only one will about the software being downloaded from the internet. If that is the only one, you should be able to click "OK" and run. You might also get warnings ranging from "the developer is unidentified" to "this might be malicious software." Both are wrong, but if you get them, you can get around these round blocks (for now) by:

• Control click on the NairnFEAMPM app and choose "Open" from the pop-up menu. You well get the same warning but should now have an "Open" button that will let you ignore that warning.
• If first option does not work, open the "General" tab of the "Security & Privacy" pane in the "System Preferences" and then start NairnFEAMPM. The "Security & Privacy" pane should have a button to run the app. Also be sure your Mac is not set to only allow apps from the "App Store".

You should only need these Apple work-arounds the first time you run NairnFEAMPM.

Switch To User-Compiled Binaries

The above download has one version of the code engines. As they develop, new version might be available before they are added the downloads on this page. You can use them sooner by installing you own binaries. Once NairnFEAMPM is running, choose "NairnFEAMPM Help" from the "Help Menu." You can click on "Installing Binaries" in the help topics on the left. That help information explains how to install all binaries needed to run calculations. The information refers back to these instructions to download the source code and them compiling them on a Mac. Once those steps are done, the instructions explain to to tell NairnFEAMPM to use those binaries instead of the bundled binaries.

Free Registration

The NairnFEAMPM system is free but uses an unlocking code to help monitor its use. By registering you will hear about developments and/or about any problems that might arise. To get a free registration code, use the "Reguest Registration Code…" command in the "Help" menu. A free code will usually arrive by email within a few days. While waiting you can use the application in "Trial Mode."