Posts

Showing posts from December, 2016

SSH Remote Host Error

Remote Host Error: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that a host key has just been changed. The fingerprint for the RSA key sent by the remote host is 51:82:11:11:7e:6f:ac:ac:de:f1:53:08:1c:7d:55:68. Please contact your system administrator. Add correct host key in /../.ssh/known_hosts to get rid of this message. Offending RSA key in /../.ssh/known_hosts:12 RSA host key for 111.11.11.111 has changed and you have requested strict checking. Host key verification failed. Solution: Only type: ssh-keygen -R "you server hostname or ip"

Cmake upgrading error on Ubuntu 14.04

I've installed CMake 3.7.1 package from CMake's website for Linux 64-bit. When I type cmake, I get the following error: CMake Error: Could not find CMAKE_ROOT !!! CMake has most likely not been installed correctly. Modules directory not found in   SOLUTION: cd cmake-3.7.1 ./bootstrap --prefix=/usr make sudo make install Upgrading process:   tar -zxvf cmake-3.7.1.tar.gz (in /opt) cd cmake-3.7.1 sudo apt install openssl libssl-dev cmake_options="-DCMAKE_BOOTSTRAP=1" cmake_options="-DCMAKE_BOOTSTRAP=1 -DCMAKE_USE_OPENSSL=ON" ./configure make -j2 sudo make install

Some useful links about OpenFOAM [Always update]

OpenFOAM Beginner: OpenFOAM website [ 1 ] [ 2 ] Installation OpenFOAM OpenFOAM user guide OpenFOAM Wiki main page List of main OpenFOAM Utilities  Turbulence free-stream boundary conditions Best practice guidelines for turbomachinery CFD Comparison of OpenFOAM versions, official and community driven versions  (What is what and who is who in the OpenFOAM environment? - Foam-Extend, OpenFOAM+, Wikki Ltd, OpenCFD Ltd, OpenFOAM Foundation)  Advanced: Advanced tips for working with the OpenFOAM shell environment PhD course in CFD with OpenSource software, Quarter 2, 2008   Implement a new turbulence model [ 1 ] [ 2 ] [ 3  - the original paper of Mentor from where SSS k-omega model is implemented in OpenFOAM] Mathematics, Numerics, Derivations and OpenFOAM ,  Tobias Holzmann Online Tools: Scripts/blockMesh grading calculation     Y+ Compute Grid Spacing for a Given Y+ (Pointwise) Viscous Grid Spacing Calculator (NASA) Y+ Wall Distance Estimation (CFD Online)  

Some problems and its solutions in OpenFOAM

Installation: Compilation with gcc instead of system compiler in OpenFOAM installation ( OpenFOAM -1 . 6 -ext on Centos 5 . 5 64 -bit) Errors 1.      The problem of OF versions relation:  If you have when you typed source etc/bashrc in foam folder, bash: /opt/foam-extend-3.1/bin/foamGetSystemInfo: No such file or directory bash: /opt/foam-extend-3.1/bin/foamCleanPath: No such file or directory bash: /opt/foam-extend-3.1/bin/foamCleanPath: No such file or directory bash: /opt/foam-extend-3.1/bin/foamCleanPath: No such file or directory bash: /opt/foam-extend-3.1/etc/settings.sh: No such file or directory bash: /opt/foam-extend-3.1/etc/aliases.sh: No such file or directory bash: /opt/foam-extend-3.1/bin/foamCleanPath: No such file or directory bash: /opt/foam-extend-3.1/bin/foamCleanPath: No such file or directory bash: /opt/foam-extend-3.1/bin/foamCleanPath: No such file or directory   Solution: ·          Comment out OpenFOAM... (that i

Some useful links about ParaView [Always update]

ParaView Beginner: Advanced: Exaggerated Topography in Paraview Similar Visualization Softwares: MeVisLab  :  Medical Image Processing and Visualization 

Some linux commands

Linux Version Information To learn your operating system (OS), and your architecture of  OS uname Linux uname -m x86_64 Version of the Linux kernel uname -r 3.10.0-229.el7.x86_64 uname -mr s Linux 4.2.0-27-generic x86_64 Print all information: uname -a Linux *** 4.2.0-27-generic #32~14.04.1-Ubuntu SMP Fri Jan 22 15:32:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux To see the Linux distribution name and the version number cat /etc/*release    or  lsb_release -a CentOS Linux release 7.1.1503  cat /proc/version Linux version 4.2.0-27-generic (buildd@lcy01-23) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #32~14.04.1-Ubuntu SMP Fri Jan 22 15:32:26 UTC 2016