11. Glossary

combination analysis
combination of several regular analysis featuring a single regular-like set of results.
Doors initial conditions for an analysis. Two configurations exist: opened-doors, and closed-doors.
venting between two volumes (or at a given interface). Connection may be passive or active. A connection is always associated to one interface. A connection is oriented: its positive direction goes from lowset volume ID to highest volume ID.
Courant Number

For a given volume, the ratio between the balance of mass flows and the volume’s mass.

Details are provided Adaptive Runtime parameters

decompression feature
Generic term grouping decompression items such as decompression panels, grids, doors, etc..
Delta P
Delta pressure between two volumes; commonly noted \(\Delta_P\). It is very common to talk about a \(\Delta_P\) at a given interface.
discharge coefficient

Coefficient applied to a raw venting area to get an effective venting area. This coefficient is commonly greater than 0.6 and lower than 0.8, although greater or lower values may be encountered.

Discharge coefficient is written cp in ESonix.

the Degree of Complexity of an anlysis depends on number of volumes, number of load cases, but also timestep and sampling. This number gives a clue about capacity of processor and disk storage required for the given Analysis.
In the ESonix context, a door is a passive vent that is assumed existing during an openend-doors initial state run and not existing during a closed-doors initial condition run.
dummy connection
A connection that does not exist in reality, but is created with zero values to create an interface in order to get automatically the calculations results for this interface.
Identification number for a given ITEM (connection, volume, loadcase, etc.).
In the context of connections, “Initialisation” is an operation occuring during the connections preprocess phase. It consists in filling any empty or blank cell within the i_to_j columns will be set to 0.0
What separates two volumes. It may be partitions, bulkhead, etc.. An interface may or may not contain zero, one or more connections.
load case
One of the several runs performed during an analysis. One load case is defined by an explosion occuring in one (or several) compartment(s). A load case is calculated for a given configuration.
merged load case
load case involving two (or more) exploded volumes. The exploded volumes need to be contiguous in reality. The resulting merged volume will have the equivalent volume equal to the sum of the merged volumes.
in the ESonix context, a node is an analysis from a given project. A node can be a regular run, a combination analysis or a sensitivity analysis.
opening hole
Opening in the fuselage taken into account for rapid decompression analysis.
opening time
For a decompression item, time to reach its full aperture.
Physical items defining an interface.
passive connection
A connection that does not evolute during the calculations. Grids are an example of passive connections.
regular analysis
(or regular run) : regular decompression analysis based on thermodynamical approach
regular run
(or regular analysis) : regular decompression analysis based on thermodynamical approach
sensitivity analysis
difference between two or more regular analysis
Operation occuring during the connections preprocess phase. It consists in filling connections blank j_to_i data with data coming from i_to_j columns.
In a “model” context, Volume refers to a “room”, or in a more geeric manneer, to any volume defined by partitions.
volume neighborhood zone

Integer >= 0 defining the depth of neighborhood of a given volume.

  • If Zone==0, the set of volumes is the volume itself
  • if Zone==1, the set of volumes includes the volume itself, AND the first level of neighbors directly connected to the volume itself.
  • etc.