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yao

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Posts posted by yao


  1. The temperature that is specified in the SURFACE_INTEGRATED_CONDITION command corresponds to the "bulk temperature". The bulk temperature is defined as: Tbulk = 1/A * INTEGRAL( Â (rho * Cp * U * T) / ( rho_avg * Cp_avg * U_avg ) ) dA. This is a mass averaged temperature. The SURFACE_OUTPUT command returns the area averaged temperature.


     



  2. Surface outputs in AcuSolve are separated based on surface element shape. When multiple element topologies are present on a single face of a model and surface output is active for both surface element types, the surface nodal output data will contain duplicate entries for the nodes that are shared between the elements. However, inspection of the results will not show equal quantities at those shared nodes. For example, consider an outlet face that has a combination of quadrilateral and triangular elements resulting from prism and tetrahedra volume elements. The surface nodal output for these surfaces will each show an entry for the nodes that are shared between adjacent quads/tris. However, the values shown in the output for the triangles will represent the contribution of that node to the triangle that it is attached to. The values shown in the output for the quadrilaterals represent the contribution of that node to the quad that it is attached to. For the case of a flux quantity, the total flux through that node can be determined by summing the contributions from the triangle and quadrilateral element.


     



  3. Some programs in the AcuSolve installation require libstdc++.so.5. This library is present on most Linux systems as part of the GNU C compiler collection. However, newer Linux kernels are updating to libstdc++.so.6, which is not compatible with the AcuSolve installation. To resolve this issue, users need to install the libstdc++.so.5 library. This can typically be found using the package manager, or by doing a google search for libstdc++ and the name of your Linux flavor/version. These libraries can be downloaded from the various repositories on the web.

    For 64 bit SuSe Linux, the package may be obtained from the following link: 
    http://rpm.pbone.net/index.php3/stat/4/idpl/7968158/com/compat-libstdc++-5.0.7-121.1.x86_64.rpm.html 

    For Ubuntu and other Debian systems, the following link can be used to search for "libstdc++.so.5" in the "Search the contents of packages" field: 
    http://www.debian.org/distrib/packages 

    A direct link to the debian package download is shown below (contained in the most recent debian version as of the date this is being posted): 
    http://packages.debian.org/squeeze/libstdc++5

     

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