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Thermal Solver
Contains thermal solver related guides, such as the TMG reference manual, thermal API guide, and error message list.
Thermal solver API
Allows you to create or add functionality to enhance the thermal solver capabilities.
User written subroutines
This section describes two types of user-written subroutines.
Subroutine and function definitions
Function definitions
Function HYDPROP
Returns a value of a fluid element for the selected property.

Thermal Solver
Contains thermal solver related guides, such as the TMG reference manual, thermal API guide, and error message list.
- Thermal solver guides
  Maya HTT's thermal solver is included in Simcenter 3D and in Simcenter Femap. This page contains links to thermal solver guides, which help you understand how the thermal solver works.
- Thermal solver reference
  Describes the format and contents of the thermal solver's input and output files
- Thermal solver theory
  Describes the theory and methods of the thermal solver.
- Thermal solver API
  Allows you to create or add functionality to enhance the thermal solver capabilities.
  - Introduction
  - User written subroutines
    This section describes two types of user-written subroutines.
    - USER1 subroutine
    - Interacting with the thermal solver
    - USERF subroutine
    - Specific examples
    - Subroutine and function definitions
      - Function definitions
        Function ARRAYINTERP
        Returns the interpolated value from a bivariate array defined with Card 9 - ARRAYDATA Array Variable Definition Card - Optional and Card 9 - ARRAYTYPE Array Variable Definition Card - Optional.
        Function CAPAPH
        Returns the capacitance of element k above its phase change temperature.
        Function CAPBPH
        Returns the capacitance of element k below its phase change temperature.
        Function HTLAT
        Returns the latent heat value of a phase change element.
        Function HYDPROP
        Returns a value of a fluid element for the selected property.
        Function ICONDELEM
        Returns the internal element number for the CG element associated with a given conductance number. This routine is used only with the CG conduction method.
        Function ICONV
        Returns the external element number of the integer internal element k.
        Function IELEMTYPE
        Returns the type of element i. If k is not zero, then k is the external element number associated with the external element number i.
        Function KCONV
        Returns the internal element number, k, of integer external element number, i. If i does not exist, k = 0 is returned.
        Function NAME
        Returns the alphabetically first group that contains the specified element. Internal group names are mapped to external group names with the subroutine LONGNAME.
        Function NOCOND
        Returns the conductance number of certain conductance type between two elements.
        Function TMGINT
        Performs linear interpolation in a table. Returns a value of the dependent variable (y) when provide the value of the independent variable (x).
        Function TPHASE
        Returns the phase change temperature of a phase change element.
      - Subroutine definitions
    - Compiling, linking, and debugging
  - Plugin functions in expressions
- Thermal solver error message list
  Lists solver messages that the thermal solver generates to communicate issues with the model or the solve.

Function HYDPROP

Returns a value of a fluid element for the selected property.

Calling convention:

value = hydprop(i,k)


Variable name	Data type	Description
Return value
`value`	Real	The value of a fluid element for the selected property.
Arguments
`i`	Integer	The input value of the fluid property. For a list of fluid properties, see the following table.
`k`	Integer	The input value of internal element number.

Table of fluid properties


i	Property	i	Property
1	Total pressure	2	Static pressure
3	Dynamic pressure	4	Mass flow
5	Volume flow	6	Velocity
7	Hydraulic diameter	8	Fluid density
9	Viscosity	10	Duct cross-sectional area
11	Specific heat	12	Thermal conductivity
13	Duct-based Reynolds number	14	Reynolds number based on nearest upstream boundary layer start.
15	Height of the element	16	Prandtl number of the element.
17	Imposed mass flow	18	Fluid density at temperature TSTD and static pressure PSTD, calculated with the Ideal Gas Law.
19	Distance from the nearest upstream boundary layer start, measured along flow path.	20	Latent heat
21	Phase change temperature	22	Capacitance above the phase change temperature.
23	Capacitance below the phase change temperature.