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--- howto:openfoam:hisa [2021/10/19 12:27]
kevin created
+++ howto:openfoam:hisa [2021/12/09 16:42] (current)
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-======Hisa Solver for OpenFOAM======
+===== HiSA Solver for OpenFOAM =====
+==== About ====
+The [[https://hisa.gitlab.io|High-speed aerodynamic (HiSA) solver]]
+is an open-source computational fluid dynamics
+(CFD) code based on the popular [[https://openfoam.com|OpenFOAM open-source CFD toolkit]].
+It is complementary to the solvers available in OpenFOAM as it is
+based around a coupled, density-based algorithm traditionally employed in
+aerospace applications in contrast to the segregated, pressure-based solvers
+better suited to low-speed flow. HiSA can be applied to solve fluid flows in the
+range of Mach numbers from approximately 0.3 to 5, and it is primarily intended for application
+to external aerodynamics in the transonic and supersonic regimes.
+Features include:
+  * AUSM+up and HLLC shock capturing schemes
+  * Non-reflective characteristic-based boundaries
+  * Support for moving meshes (with AUSM+up)
+  * Quadratic modal solid modelling
+  * 6DoF solid body motion
+  * Adaptive mesh refinement for shocks
+  * Multi-region solution with CHT
+==== Mesh generation ====
+HiSA should work with any structured, cut-cell cartesian or polyhedral mesh.
+OpenFOAM can generate structured meshes using the ''blockMesh'' tool, and
+unstructured meshes using ''snappyHexMesh''. Support for boundary layers is limited
+in ''snappyHexMesh'', and the open-source code [[https://cfmesh.com/cfmesh/|cfMesh]]
+offers an improved option.
+[[https://gitlab.com/hisa/cfmesh|A version of cfMesh]] which is updated for the
+latest versions of OpenFOAM and contains some enhancements such as
+support for adaptive mesh refinement, is distributed alongside HiSA.
+Finally, OpenFOAM includes converters from several popular mesh formats,
+allowing commercial third-party meshing tools to be used if desired.
+Some examples are contained in the tutorial cases for HiSA.
+==== Validation ====
+The CHPC provides computing resources to run a validation test suite
+with every release of the code. This consists of a collection of standard
+test cases, with validation results
+[[http://hisa.gitlab.io/archive.html|available on the HiSA website]].
+Although HiSA can be built with both the [[https://openfoam.org|OpenFOAM Foundation]]
+and [[https://openfoam.com|OpenCFD]] forks of the code, at present
+the validation script is only run with the OpenCFD (vXXXX) versions. The tutorial
+examples may also need minor modifications to run in the Foundation version
+due to some differences in input formats.
+==== Getting started ====
+First, users need to be familiar with the OpenFOAM environment to understand the
+case setup for HiSA. Documentation is available on the
+[[https://www.openfoam.com/documentation/user-guide|OpenCFD]] and
+[[https://cfd.direct/openfoam/user-guide/|CFD Direct]] websites.
+Documentation for HiSA describing its unique settings and boundary conditions
+can be found on the [[http://hisa.gitlab.io/doc.html|website]].
+The [[https://gitlab.com/hisa/hisa|tutorials in the code repository]] are
+usually the best place to start setting up a case, by copying and modifying a
+similar case.
+Another way to get started quickly is to use the
+[[https://gitlab.com/opensimproject/CfdOF|CfdOF]] GUI to set up cases using
+a graphical front-end. The case setups written by it can be uploaded and run
+on the CHPC in the same way as a manually set-up case.
+The code for HiSA can be downloaded and installed on your local machine
+[[https://hisa.gitlab.io/download.html|as described on the HiSA website]].
+It can also be transferred to your home directory on CHPC and compiled by
+following the directions for
+[[howto:openfoam#compiling_your_own_openfoam_code|compiling your own OpenFOAM code]].
+HiSA should now be ready to run on CHPC, and it is a good idea to test one of the
+supplied tutorial cases in the ''tutorials'' subdirectory of the HiSA repository,
+to ensure that all is working.
+==== Disclaimer ====
+This offering is not approved or endorsed by OpenCFD Limited, producer and distributor of the OpenFOAM software via www.openfoam.com, and owner of the OPENFOAM(r) and OpenCFD(r) trade marks.

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