Hi Matt, Have you built your Nektar++ install from the source code or you’ve installed from packages? You mention that Arpack is installed, however, if you’ve built from source code, you’ll need to ensure that the NEKTAR_USE_ARPACK option was set to ON when you configured the build with CMake (if you didn’t use the cmake GUI (ccmake) and instead configured from the command line, you can add the command line option -DNEKTAR_USE_ARPACK=ON) If you installed Arpack from packages on Ubuntu, you’ll also need to ensure that the “dev” package is installed (I think on Ubuntu it’s call libarpack2-dev). Hope that helps. However, if you have gone through the above process and you know that Nektar has been built with Arpack support, let us know and maybe someone else can offer some other suggestions. Kind regards, Jeremy

On 22 Feb 2021, at 18:39, Matt Duran <matt.duran60@gmail.com> wrote:

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Hello, my name is Matt Duran and I am from the University of Central Florida. I have recently begun using Nektar++ 5.0.1 on Ubuntu and was going through the ‘Global Stability Analysis: Cylinder Flow’ tutorial. However, when I ran the ‘IncNavierStokesSolver’ with ‘Cylinder_Direct.xml’ I got the following error:

<image.png>

Arpack is already installed and the relevant sections of the .xml file is shown below.

<image.png>

I was wondering if I could get some assistance on why this error may be happening and how to fix it.

Thanks in advance,

Matt Duran

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