I have just found a very useful application to edit PDF’s on all major operating systems (Windows, Mac, Linux): Qoppa PDF Studio. You can edit, add comments, underline and make various other changes to your PDF files with a very easy to use interface.
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OpenCFD releases patched OpenFOAM 1.5
OpenCFD released a patched version of OpenFOAM 1.5 today, via a git repository. You can find the official announcement here. The procedure to install it on openSUSE 11.0 is straightforward: Be sure to have git installed. You can check it with rpm -qa git If it is not installed, you can easily install it with the command (as root): zypper in git provided you have the OSS repository in your repository list (check with zypper lr, and eventually add it using Yast -> Software -> Installation sources). As a user, download the OpenFOAM patched source code using the command: git clone git://repo.or.cz/OpenFOAM-1.5.x.git This will create a directory called OpenFOAM-1.5.x, containing…
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OpenFOAM 1.5 molecular dynamics solver user guide
OpenFOAM 1.5 introduced a molecular dynamics solver, which has been documented by the multi-scale flows group of the Mechanical Engineering department at the University of Strathclyde. You can find the documentation on the wiki page of the group.
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New blog look!
As you can see, I radically changed the look of my blog. After many attempts, I finally decided what theme to use to replace the old one which served me for a long time!
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Porous zone in OpenFOAM
OpenFOAM offers an easy way to solve for a single flow in systems with porous zones, with the possibility of specifying the porosity and to use Darcy-Forchheimer or power law models. This feature is very versatile, allowing the user to specify also porous zones not aligned with the main reference frame and multiple porous zones in the same case. Currently this feature is implemented in a compressible flow solver (rhoPorousSimpleFoam), with both an explicit and an implicit treatment of the momentum source term due to the presence of the porous zone. I will show the basic functionalities of this OpenFOAM feature with a simple example of a 2D channel made…
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Unsteady boundary conditions in openFOAM
I recently had to help a friend setting up a case in OpenFOAM, where a ramp boundary condition for the velocity was required. Apparently OpenFOAM doesn’t offer this boudary condition, or at least it might seem so at a first impression. Actually, OpenFOAM offers a very general way to specify unsteady boundary conditions called timeVaryingFixedValue, which can read a data set from a text file, interpolate them with respect to time and use them to generate the unsteady boundary condition. I will show how to use this boundary condition with a simple example of a ramp for a velocity boundary condition. We want the velocity to ramp from the value…
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A good idea from Fedora
I came to know from Moro’s blog that Fedora has a project called Fedora Unity with, among the others, the task to prepare re-spins of the ISO images of the distribution. I think it is a very good service, because who starts to use the distribution do not need to download the ISO and then a huge number of updates. It would be nice if other distributions like openSUSE did the same, and I hope they will consider the idea in the future.