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August 2020

17 participants
12 discussions

Jumps of lift force trace in simulation of forced vortex induced vibration
by Yong Wang 10 Aug '20

10 Aug '20

******************* This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address. ******************* Hello, I am simulating forced vortex induced vibration by Nektar++ (latest version) and found jumps in the lift force trace as shown below. The jumps occur every 5 seconds, which is half of the period of the forced sinusoidal vibration (when displacement of the body is zero). The XML session file is also attached. I tried to find the reason from the formulation of additional body force due to the usage of inertial coordinate system fixed on the vibrating body, but can't explain these jumps. Do you have some ideas about this issue? Thanks a lot. [image: drag_lift.png] Best wishes, Yong Wang

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Nektar parallel on Windows.
by Edward Threlfall 03 Aug '20

03 Aug '20

******************* This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address. ******************* Dear users, I am trying to run Nektar on Windows using MPI and I am following the instructions in the blog post of May 18 2020. I find that the code builds successfully and it runs the example (cyl.xml) using multiple threads but it looks like multiple copies of the same work are being run, rather than a single (faster) multi-threaded simulation. I wonder if anyone has experienced the same issue, or has any advice on how to fix this? Could it be some kind of MPI version conflict (I imagine the `multiple copies' is the default behaviour if MPI is not working)? Thanks, Ed Threlfall.

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