DNS 1-5 Storage Format
Storage Format
The volume data provided is stored in the XML Parallel vtkUnstructuredGrid format, e.g, filename.pvtu [1]. The Parallel data format does not actually contain any data but references other serial files (Serial vtkUnstructuredGrid) containing the data for each grid partition used for the computation, e.g., filename_partition_number.vtu. Both the .pvtu (or any .vtu) file can be easily read through the open-source Paraview software, a multi-platform application for data analysis and visualization [2].
Instantaneous data format
The dataset consists of a single .pvtu file per snapshot, directly referencing all the nondimensional variables and their spatial derivatives as well as the node positions. For the sake of handling, the instantaneous data was extracted from a limited region of the computational domain shown in Fig. X.
The names of the provided variables are:
- p, pressure;
- T, temperature;
- u, velocity component in x-direction;
- v, velocity component in y-direction;
- w, velocity component in z-direction.
The spatial derivatives of each variable are named as variable_di where i={x,y,z}, e.g., u_dy is the derivative of the first component of the velocity vector with respect to the x-direction.
All the quantities are made dimensionless with respect to the reference state:
R_max = 0.0762 m
p_ref = 89377 Pa
T_ref = 293.15 K
u_ref = 46.186 m/s
Ma = 0.13455
Statistical data format
The dataset consists of a set of .pvtu files, possibly grouping similar statistics:
- favre_averaged_fields.pvtu:
Favre averaged velocity, \tilde{u}, Favre averaged temperature, \tilde{T}
- averaged_fields.pvtu:
- averaged velocity, \overline{u}_{i}
- averaged pressure, \overline{p}
- averaged density, \overline{\rho}
- averaged temperature, \overline{T}
- averaged_shear_stress.pvtu: \overline{\tau_{ij}}
- averaged_heat_flux.pvtu: \overline{q_i}
- Reynolds_stress.pvtu: \mathchal{R}_{ij}
- budget_terms.pvtu:
- convection C_{ij};
- production P_{ij};
- diffusion D^1_{ij};
- diffusion D^2_{ij};
- diffusion D^3_{ij};
- redistribution/pressure strain, \Phi_{i j};
- pressure dilatation, \Phi_{i j}^{\prime};
- dissipation, \epsilon_{ij};
- density fluctuation effect K_{ij}.
where i and j range between 1 and 3 and u_1, u_2, u_3 are alias of u, v, w
References
[1] https://vtk.org/wp-content/uploads/2015/04/file-formats.pdf
Contributed by: Francesco Bassi, Alessandro Colombo, Francesco Carlo Massa — Università degli studi di Bergamo (UniBG)
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