# 2.2. Sod's Shock Tube Problem

{% hint style="info" %}
The 1D Sod shock tube, which can be solved analytically, is a Riemann problem used as a standard test problem in computational hydrodynamics.

\[1] G.A. Sod, A survey of Several Finite Difference Methods for Systems of Nonlinear Hyperbolic Conservation, Journal of Computational Physics, 1978 vol. 27, pp. 1-31.

\[2] J. Xiao, W. Breitung, M. Kuznetsov, H. Zhang, J. R. Travis, R. Redlinger, T. Jordan, “GASFLOW-MPI: A new 3-D parallel all-speed CFD code for turbulent dispersion and combustion simulations: Part I: Models, verification and validation”, International Journal of Hydrogen Energy, March 2017.

This tutorial demonstrates how to do the following:

* Launch the GASFLOW graphical user interface: GASVIEW.
* Create a new project.
* Generate the mesh using the built-in tool.
* Set numerical control parameters.
* Enable the second-order discretization scheme for improved predictions.
* Set gas properties, initial conditions and boundary conditions for a shock tube problem.
* Set physical model for a shock tube problem.
* Set output parameters for a 1D shock tube problem.
* Generate and check the GASFLOW input file, ingf.
* Set the remote GASFLOW server and run a calculation.
* Plot the calculation results.
  {% endhint %}

1\) GASFLOW input file

{% file src="/files/v7kCiiOgFV5VDQuj3wc5" %}

2\) GASFLOW results files

{% file src="/files/AeEYwqe4XKRWUAEIuXr3" %}

{% file src="/files/ZwTCRjuli9Vo6xaNLq7q" %}

3\) Comparison to the analytical solutions

{% content-ref url="/pages/GGjiM9hBn4Db1LggvvtK" %}
[\[AS-FD 2\] Transient Compressible Flow](/5.-verification-and-validation/5.1.-fluid-dynamics/as-fd-2-transient-compressible-flow.md)
{% endcontent-ref %}

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