Wengen 1: Cloud collision test



A high speed collision between two gas spheres. The spheres have a temperature profile so that they are in gravitational equilibrium with their NFW density profiles.

Included physics

Hydrodynamical test that can be run with and without self-gravity of the gas. The results with and without gravity are quite different.


To test the shock capturing ability of a code in an astro-physically interesting setting.

Analytical solution

If there is an analytic solution to the test put this (or a reference to it) here.

Publications using this test


Useful references

Relevant background reading, or similar tests to be referenced here. This can also cross-reference other pages within this wiki.

Details of setup

Units and constants

See unit description for the Wengen 3 test.

Initial Conditions

Carefully describe the initial conditions here. Please include the actual files! (see below).

A quick warning to anyone trying this test with SPH. The supplied ICs are not relaxed and so unreliable. Just look at top left panel above.


Add the initial conditions files here. Please make sure that your file format is described in File Formats.

Grid Resolution SPH Resolution
Low-res wengen1.low.h5 128x128x128 wengen1.low.std ~200k part
Med-res wengen1.med.h5 256x256x256 wengen1.med.std ~4e6 part
Hi-res wengen1.hi.h5 512x512x512 wengen1.hi.std -

It would be good to always add the following: Please see File Formats for a description of the above file formats and a collection of conversion tools.

How to analyse the test?

Describe here how the test is analysed and how it can be compared with results from other simulations, or to analytic results. It would be helpful to include a link to the analysis software used. It would be good to always add the following: Please see Analysis Tools to obtain the above analysis tools.


List here some example results from the test and describe their implications. Typically this will mean posting a couple of results figures.

Tests run so far

Describe here the software used to perform the test and the results. We recommend using separate pages for each piece of software, though many can be presented simultaneously if this is more convenient. The former is more work, but is also more easily expanded upon in the future. Please store these tests in the namespace indcodetests, e.g.:


so that these do not appear in the menu in the side bar.

Code Person Publication
The Template Test: myfavecode Bob

Discussion forum for this test

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