Subsections

• Scalar Variables
• Velocity Values
• Stream Functions
• Loadcases

Result Types Processed

 

All the results in the PHI(DA) file are transferred to FEMVIEW. These results may be split into two results types:-

1.

Scalar variables (for example P1).

2.

Velocity values.

Each of the results types are handled by the interface program in a different manner and are discussed in the following sections.

Scalar Variables

 

With the exception of velocities all results produced by PHOENICS are scalar values at cell centres. To enable the full range of FEMVIEW facilities to be used these values may be transferred to FEMVIEW in two forms.

The first is as FEMVIEW element invariant values, these are results that are constant for the whole element, and are referenced by element number. These can be considered to be located at cell centres. The PHOENICS results are transferred unchanged to FEMVIEW. These results should be used for checking the numerical data. Any results for blocked cells are also transferred as invariant, but these can easily be filtered from any results display within FEMVIEW (see section 4.10). The element invariant values are provided in order to give the FEMVIEW user the opportunity to review the results values exactly as they appear in the PHI(DA) file.

As an alternative form nodally averaged values can be provided. These are values calculated at the cell corners, by averaging the results from the surrounding cell centres. If a cell is fully blocked, its results are ignored when calculating the nodal average values, consequently no results are calculated for nodes entirely surrounded by fully blocked cells. Nodally averaged results enable the user to display contours, numerics, peak values, and use the results calculation functions provided in FEMVIEW. Variables at cell corners are requested using the interface command 'VARIABLE name NODA ', which is the default.

The names allocated to the results are the names generated by PHOENICS and output in the PHI(DA) file. NODAL and INVARIANT locations can both be selected using the interface command 'VARIABLE name BOTH'.

Four character variables names in a PHOENICS PHI file can be converted to six character names for display in FEMVIEW. The file containing the names conversion must be specified in a FEMSYS resource file 'femsys.ini' under the resource name

 
Femsys.PostPhoenics.*.names

The value given for this resource is the name of the file including the pathname and can be up to 98 characters long. An example of such file is given in Appendix C. Information on resource files can be found in the FEMGV Installation and Customisation Guide.

Velocity Values

 

Velocity results may also be transferred as nodally averaged or invariant results. Nodally averaged results are not provided for the I=1 or NX, J=1 or NY or K=1 or NZ grid planes. If one component of velocity is selected then all components are transferred.

Stream Functions

 

If a grid is monoblock and two dimensional and nodally averaged velocities have been requested the stream function is calculated in the interface and made available for display as a nodally averaged scalar value 'STREAM'. When the flow is compressible and nodally averaged densities have also been requested these will be used in the stream function calculation.

Loadcases

 

Within FEMVIEW, results are grouped according to the input conditions placed on the analysis. A single model may be analysed under a series of different input conditions, and these groups of results are stored as distinct 'loadcases' in the FEMVIEW data base.

Each PHI(DA) file produced by PHOENICS can only contain results for one set of input conditions, i.e. one loadcase, so if a model is being created a default loadcase name of L1 may be used. If results are being appended to an existing model, a name for the new loadcase must be provided by the user using the interface command 'LOADCASE name'.

A typical loadcase summary displayed in FEMVIEW for PHOENICS results will be as follows :-

     NAME            DETAILS AND RESULTS STORED
     ----            --------------------------

     L1              STATIC     Phoenics Results
                     NODAL:   P1        H1       VEL1    STREAM1

Examples of how to access these results are given in Chapter 4.