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Description: This group provides a forum for users of the software system AMRITA. See http://www.amrita-ebook.org for more details.
 

restart using previously computed fields and different BC and domains 
  Does anybody know if it is possible to combine computation results from one run to the next. For example, suppose I want to use a fully established 2D cellular detonation profile as initial condition for subsequent studies where the boundary conditions (e.g, diffraction, pertubations, etc...) would... more »
By matei  - Nov 19 - 2 new of 2 messages    

Grid adaption on curved surface 
  I have a curvilinear grid geometry with a curved surface in it (circular). The flow currently shows artefacts on the wall due to the N-sided nature of the surface. I could use a very fine mesh structure for that wall but ideally, for the mesh adaption process, the elements on the curved wall would need to be fitted to the exact computed wall... more »
By chris  - Nov 19 - 3 new of 3 messages    

Multiple inert gas EquationSet 
  I have a shock tube model which I'd like to convert to use two distinct inert gases (driver/driven). Looking in stdlib/equations, I found ShockBubbleEquations which looked promising. However, the machinery required by BCG doesn't seem to be present, so the latter chokes on its call with a 'BCG under construction' message. (ie, no... more »
By chris  - Nov 3 - 3 new of 3 messages    

Porous Wall Boundary Condition 
  Hi all, Matei and I wanting to simulate his porous wall detonation experiments. Does anyone know of or have any ideas for a boundary condition which mimics the "loss" effects or non-perfect reflectivity of a porous wall? My idea was to include a non-reactive layer of complient (i.e. a gas of some non-infinite density)... more »
By Gary Sharpe  - Oct 30 - 6 new of 6 messages    

time integration at a fixed grid location 
  I would like to know how one can do a time-integration at a fixed location on the grid, in a multi-grid situation. For example, right now I have a piece of auxiliary code where i compute a new field variable NEW at each time step, from which I want its time integral W[7]. For a time integration, I simply cumulate the... more »
By matei  - Oct 28 - 2 new of 2 messages    

recording data along an internal boundary defined by a levelset 
  I hope someone can help me with this one. In a simulation with an internally defined boundary, defined using the levelset function PSI, I would like to record some variables along a line of constant PSI. Is there any direct way I can do that? So far, I have used the "probe" command, while manually parametrizing a sequence of (x,y)... more »
By matei  - Oct 19 - 3 new of 3 messages    

Trouble to startup a supersonic flow over a triangle 
  I've been trying to run simulations that consist of a supersonic freestream flowing over a triangular obstacle. The problem I'm facing most of the time is to startup the simulation, especially when the flow turns around sharp corners. To provide an example, I uploaded a script called "Wedge", which generates a NaN at the 15th phase. Does... more »
By Jimmy  - Sep 10 - 2 new of 2 messages    

Supersonic wedge into combustible gas 
  I'm a PhD student at McGill University, and I intend to use AMRITA to investigate different flowfields around a projectile travelling at hypersonic velocities into a combustible gas. So far I've been able to run a simulation with a sphere as the projectile. Here is a part of the script specifying the boundary... more »
By Jimmy  - Aug 27 - 6 new of 6 messages    

finite rate Euler 
  There is a FiniteRateEulerEquations within amr_sol which was never quite finished. I would like to use such a package and would like to know whether anyone out there has made any headway in this direction or has any plans to do it, whether from scratch or starting from what has been done in the existing code.... more »
By Hans Hornung  - Aug 20 - 3 new of 3 messages    

plotting a subset of the domain 
  Hi, I am having some trouble plotting a subset of my 2D computational domain. I am trying the command "clip to ..." and "clip on ..." as per the example in the help manual. However, when running the example script, both "clip to" and "clip on" yield the same result. I expected the "clip on" to rescale to the pagesize.... more »
By matei  - Aug 20 - 4 new of 4 messages    

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