Appendix

Appendix 1 - Available User's Arguments

Available Starter User's Arguments

Table 1. Starter User’s Arguments – Material Law for Shells
Variable	Size	Type	Write/read	Definition
`IIN`	1	Integer	R	Input file unit (Starter input file)
`IOUT`	1	Integer	R	Output file unit (Starter output file)
`UPARAM`	`NUPARAM`	Float	W	User’s parameter
`MAXNUPARAM`	1	Integer	R	Maximum size of `UPARAM`
`NUPARAM`	1	Integer	W	Size of `UPARAM`
`NUVAR`	1	Integer	W	Number of user’s variables
`IFUNC`	`NFUNCT`	Integer	W	Function number array
`MAXNFUNC`	1	Integer	R	Maximum size of `IFUNC`
`NFUNCT`	1	Integer	W	Size of `IFUNC`
`PARMAT`	3	Float	W	(1) Stiffness modulus for interface (2) Young's modulus (for shell) (3) Poisson’s ratio (for shell)

Table 2. Starter User’s Arguments – Material Law for Bricks
Variable	Size	Type	Write/read	Definition
`IIN`	1	Integer	R	Input file unit (Starter input file)
`IOUT`	1	Integer	R	Output file unit (Starter output file)
`UPARAM`	`NUPARAM`	Float	W	User’s parameter
`MAXNUPARAM`	1	Integer	R	Maximum size of `UPARAM`
`NUPARAM`	1	Integer	W	Size of `UPARAM`
`NUVAR`	1	Integer	W	Number of user’s variables
`IFUNC`	`NFUNCT`	Integer	W	Function number array
`MAXNFUNC`	1	Integer	R	Maximum size of `IFUNC`
`NFUNCT`	1	Integer	W	Size of `IFUNC`
`STIFINT`	1	Integer	W	Stiffness modulus for interface

Table 3. Starter User’s Arguments – Spring Property
Variable	Size	Type	Write/read	Definition
`IIN`	1	Integer	R	Input file unit (Starter input file)
`IOUT`	1	Integer	R	Output file unit (Starter output file)
`NUVAR`	1	Integer	W	Number of user’s variables
`UVAR`	`NUVAR`* `NEL`	Float	R/W	User’s variable
`PARGEO`	*	Float	W	(1) Skew number (2) Stiffness for interface (3) Front wave option
`NEL`	1	Integer	R	Number of elements
`IPROP`	1	Integer	R	Property number
`IX`	3* `NEL`	Float	R	Spring connectivity
`XL`	`NEL`	Float	R	Element length
`MASS`	`NEL`	Float	W	Element mass
`XINER`	`NEL`	Float	W	Element inertia (spherical)
`STIFM`	`NEL`	Float	W	Element stiffness (time step)
`STIFR`	`NEL`	Float	W	Element rotation stiffness (time step)
`VISCM`	`NEL`	Float	W	Element viscosity (time step)
`VISCR`	`NEL`	Float	W	Element rotation viscosity (time step)

Table 4. Starter User’s Arguments – Solid Property
Variable	Size	Type	Write/read	Definition
`NEL`	1	Integer	R	Number of elements
`IIN`	1	Integer	R	Input file unit (Starter input file)
`IOUT`	1	Integer	R	Output file unit (Starter output file)
`NUVAR`	1	Integer	W	Number of user’s variables
`UVAR`	`NUVAR`* `NEL`	Float	R/W	User’s variable
`PARGEO`	*	Float	W	(1) Skew number (2) Stiffness for interface (3) Front wave option
`IPROP`	1	Integer	R	Property number
`IMAT`	1	Integer	R	Material number
`SOLID_ID`	`NEL`	Integer	R	Solid Element id t=0
`EINT`	`NEL`	Float	W	Total internal energy t=0
`VOL`	`NEL`	Float	R/W	Initial volume
`OFF`	`NEL`	Float	R/W	Delete flag
`RHO`	`NEL`	Float	R/W	Density
`SIG`	6*`NEL`	Float	R/W	Stress tensor
`XX1`	`NEL`	Float	R	X coordinate node 1
`YY1`	`NEL`	Float	R	Y coordinate node 1
`ZZ1`	`NEL`	Float	R	Z coordinate node 1
`XX2` . . `ZZ8`	`NEL`	Float	R	Same for node 2 to 8
`VX1`	`NEL`	Float	R	X velocity node 1
`VY1`	`NEL`	Float	R	Y velocity node 1
`VZ1`	`NEL`	Float	R	Z velocity node 1
`VRX1`	`NEL`	Float	R	X rotational velocity node 1
`VRY1`	`NEL`	Float	R	Y rotational velocity node 1
`VRZ1`	`NEL`	Float	R	Z rotational velocity node 1
`MAS1`	`NEL`	Float	W	Mass node 1
`MAS2` . . `MAS8`	`NEL`	Float	W	Same for node 2 to 8
`INN1`	`NEL`	Float	W	Inertia node 1
`INN2` . . `INN8`	`NEL`	Float	W	Same for node 2 to 8
`STIFM`	`NEL`	Float	W	Element stiffness (time step)
`STIFR`	`NEL`	Float	W	Element rotation stiffness (time step)
`VISCM`	`NEL`	Float	W	Element viscosity (time step)
`VISCR`	`NEL`	Float	W	Element rotation viscosity (time step)

Table 5. Starter User’s Arguments – Sensor
Variable	Size	Type	Write/read	Definition
`IIN`	1	Integer	R	Input file unit (Starter input file)
`IOUT`	1	Integer	R	Output file unit (Starter output file)

Available Engine User's Arguments

Table 6. Engine User’s Arguments – Material Law for Shells
Variable	Size	Type	Write/read	Definition
`NEL`	1	Integer	R	Number of elements
`UVAR`	`NUVAR`* `NEL`	Float	R/W	User’s variable
`UPARAM`	`NUPARAM`	Float	W	User’s parameter
`NUPARAM`	1	Integer	W	Size of `UPARAM`
`NUVAR`	1	Integer	W	Number of user’s variables
`NFUNCT`	1	Integer	W	Size of `IFUNC`
`IFUNC`	`NFUNCT`	Integer	W	Function number array
`NPF`	*	Integer	R	Function array
`NPT`	1	Integer	R	Number of layers or integration points
`IPT`	1	Integer	R	Layer or integration point number
`IFLAG`	*	Integer	R	Geometrical flags
`TF`	*	Float	R	Function array
`NGL`	`NEL`	Integer	R	Element number
`TIME`	1	Float	R	Current time
`TIMESTEP`	1	Float	R	Current time step
`RHO0`	`NEL`	Float	R	Initial density
`AREA`	`NEL`	Float	R	Area
`EINT`	`NEL`	Float	R	Total internal energy
`THKLY`	`NEL`	Float	R	Layer thickness
`EPSPXX`	`NEL`	Float	W	Strain rate XX
`DEPSXX`	`NEL`	Float	W	Strain increment XX
`EPSXX`	`NEL`	Float	W	Strain XX
`SIGOXX`	`NEL`	Float	W	Old elasto-plastic stress XX
`SIGNXX`	`NEL`	Float	W	New elasto-plastic stress XX
`SIGVXX`	`NEL`	Float	W	Viscous stress XX
`SOUNDSP`	`NEL`	Float	W	Sound speed (time step)
`VISCMAX`	`NEL`	Float	W	Max damping modulus (time step)
`THK`	`NEL`	Float	R/W	Thickness
`PLA`	`NEL`	Float	R/W	Plastic strain
`OFF`	`NEL`	Float	R/W	Delete flag

Table 7. Engine User’s Arguments – Material Law for Bricks
Variable	Size	Type	Write/read	Definition
`NEL`	1	Integer	R	Number of elements
`UVAR`	`NUVAR`* `NEL`	Float	R/W	User’s variable
`UPARAM`	`NUPARAM`	Float	W	User’s parameter
`NUPARAM`	1	Integer	W	Size of `UPARAM`
`NUVAR`	1	Integer	W	Number of user’s variables
`NFUNCT`	1	Integer	W	Size of `IFUNC`
`IFUNC`	`NFUNCT`	Integer	W	Function number array
`NPF`	*	Integer	R	Function array
`TF`	*	Float	R	Function array
`NGL`	`NEL`	Integer	R	Element number
`TIME`	1	Float	R	Current time
`TIMESTEP`	1	Float	R	Current time step
`RHO0`	`NEL`	Float	R	Initial density
`RHO`	`NEL`	Float	R	Density
`VOLUME`	`NEL`	Float	R	Volume
`EINT`	`NEL`	Float	R	Total internal energy
`EPSPXX`	`NEL`	Float	W	Strain rate XX
`DEPSXX`	`NEL`	Float	W	Strain increment XX
`EPSXX`	`NEL`	Float	W	Strain XX
`SIGOXX`	`NEL`	Float	W	Old elasto-plastic stress XX
`SIGNXX`	`NEL`	Float	W	New elasto-plastic stress XX
`SIGVXX`	`NEL`	Float	W	Viscous stress XX
`SOUNDSP`	`NEL`	Float	W	Sound speed (time step)
`VISCMAX`	`NEL`	Float	W	Max damping modulus (time step)
`OFF`	`NEL`	Float	R/W	Delete flag

Table 8. Engine User’s Arguments – Spring Property
Variable	Size	Type	Write/read	Definition
`NEL`	1	Integer	R	Number of elements
`IPROP`	1	Integer	R	Property number
`UVAR`	`NUVAR`* `NEL`	Float	R/W	User’s variable
`NUVAR`	1	Integer	W	Number of user’s variables
`FX`	`NEL`	Float	R/W	Tension force
`FY`	`NEL`	Float	R/W	Y shear force
`FZ`	`NEL`	Float	R/W	Z shear force
`XMOM`	`NEL`	Float	R/W	Torsion moment
`YMOM`	`NEL`	Float	R/W	Y bending moment
`ZMOM`	`NEL`	Float	R/W	Z bending moment
`EINT`	`NEL`	Float	R/W	Total internal energy
`OFF`	`NEL`	Float	R/W	Delete flag
`STIFM`	`NEL`	Float	W	Element stiffness (time step)
`STIFR`	NEL	Float	W	Element rotation stiffness (time step)
`VISCM`	`NEL`	Float	W	Element viscosity (time step)
`VISCR`	`NEL`	Float	W	Element rotation viscosity (time step)
`MASS`	`NEL`	Float	W	Element mass
`XINER`	`NEL`	Float	W	Element inertia (spherical)
`DT`	1	Integer	R	Time step
`XL`	`NEL`	Float	R	Element length
`XL`	`NEL`	Float	R	Element length
`VX`	`NEL`	Float	R	Tension velocity
`RY1`	`NEL`	Float	R	Node 1 Y bending rotational velocity
`RZ1`	`NEL`	Float	R	Node 1 Z bending rotational velocity
`RX`	`NEL`	Float	R	Torsional velocity
`RY2`	`NEL`	Float	R	Node 2 Y bending rotational velocity
`RZ2`	`NEL`	Float	R	Node 2 Z bending rotational velocity

Table 9. Engine User’s Arguments
Variable	Size	Type	Write/read	Definition
`NEL`	1	Integer	R	Number of elements
`IOUT`	1	Integer	R	Output file unit (Engine output file)
`UVAR`	`NUVAR`* `NEL`	Float	R/W	User’s variable
`IPROP`	1	Integer	R	Property number
`IMAT`	1	Integer	R	Material number
`SOLID_ID`	`NEL`	Integer	R	Solid Element ID
`EINT`	`NEL`	Float	R	Total internal energy
`VOL`	`NEL`	Float	R	Initial volume
`OFF`	`NEL`	Float	R/W	Delete flag
`RHO`	`NEL`	Float	R/W	Density
`SIG`	6* `NEL`	Float	R/W	Stress tensor
`XX1`	`NEL`	Float	R	X coordinate node 1
`YY1`	`NEL`	Float	R	Y coordinate node 1
`ZZ1`	`NEL`	Float	R	Z coordinate node 1
`XX2` . . `ZZ8`	`NEL`	Float	R	Same for node 2 to 8
`VX1`	`NEL`	Float	R	X velocity node 1
`VY1`	`NEL`	Float	R	Y velocity node 1
`VZ1`	`NEL`	Float	R	Z velocity node 1
`VRX1`	`NEL`	Float	R	X rotational velocity node 1
`VRY1`	`NEL`	Float	R	Y rotational velocity node 1
`VRZ1`	`NEL`	Float	R	Z rotational velocity node 1
`FX1`	`NEL`	Float	W	X force node 1
`FY1`	`NEL`	Float	W	Y force node 1
`FZ1`	`NEL`	Float	W	Z force node 1
`MX1`	`NEL`	Float	W	X moment node 1
`MY1`	`NEL`	Float	W	Y moment node 1
`MZ1`	`NEL`	Float	W	Z moment node 1
`STIFM`	`NEL`	Float	W	Element stiffness (time step)
`STIFR`	`NEL`	Float	W	Element rotation stiffness (time step)
`VISCM`	`NEL`	Float	W	Element viscosity (time step)
`VISCR`	`NEL`	Float	W	Element rotation viscosity (time step)

Table 10. Engine User’s Arguments – Sensor
Variable	Size	Type	Write/read	Definition
`ID`	`NEL`	Integer	R	Sensor ID

Appendix 2 - Communication Between User's Subroutines and Radioss Code

The main functions to access user’s properties and materials are return functions and storage functions.

Return Function	Variables		Description
`INTEGER IP = GET_U_P(PID)`	`PID`	Integer property ID	Returns a property number.
`INTEGER PID = GET_U_PID(IP)`	`IP`	Property number	Returns the user property ID corresponding to the user property number `IP`.
`FLOAT PARAMI = GET U GEO (I,IP)`	`I`	Parameter index (1 for the first parameter, …)	Returns the user geometry parameters.
`FLOAT PARAMI = GET U GEO (I,IP)`	`IP`	Property number	Returns the user geometry parameters.
`INTEGER II = GET U PNU (I,IP,KK)` `IFUNCI = GET_U_PNU (I,IP,KFUNC)` `IPROPI = GET_U_PNU(I,IP,KPROP)` `IMATI = GET_U_PNU(I,IP,KMAT)`	`I`	Parameter index	Returns the user-stored function (if `KK`=`KFUNC`), material (if `KK`=`KMAT`), or property (if `KK`=`KPROP`) numbers. See Starter subroutine for corresponding ID storage.
	`IP`	Property number
	`KK`	Parameters `KFUNC`, `KMAT`, `KPROP`
`INTEGER IM = GET_U_M(MID)`	`MID`	Material ID	Returns a material number.
`INTEGER MID = GET_U_MID(IM)`	`IM`	Material number	Returns the user material ID corresponding to user material number `IM`.
`FLOAT PARAMI = GET_U_MAT(I,IM)`	`I`	Parameter index	Returns the user material parameters. Note: `GET_U_MAT(0,IMAT)` returns the density.
`FLOAT PARAMI = GET_U_MAT(I,IM)`	`IM`	Material number
`INTEGER IFUNCI = GET_U_MNU (I,IM,KFUNC)`	`I`	Variable index	Returns the user-stored function numbers (function referred by user’s materials). See the Starter material user’s subroutine for corresponding ID storage.
	`IM`	Material number
	`KFUNC`	Only functions are yet available
`FLOAT Y = GET_U_FUNC(IFUNC,X,DYDX)`	`IFUNC`	Function numbered obtained by `IFUNC = GET_U_MNU(I,IM, KFUNC`) or `IFUNC = GET_U_PNU(I,IP,KFUNC)`	Returns Y(X).
	`X`	X value
	`DYDX`	Slope dY/dX

Storage Function	Description
`INTEGER ierror = SET_U_PNU(func_index, fun_id, KFUNC)`	Stores Radioss function fun_id in the current user property buffer at a position referenced by `func_index`.
`INTEGER ierror = SET_U_PNU(mat_index, mid, KMAT)`	Stores Radioss material mid in the current user property buffer at a position referenced by `mat_index`.
`INTEGER ierror = SET_U_PNU(prop_index, pid, KPROP)`	Stores Radioss property pid in the current user property buffer at a position referenced by prop_index.
`INTEGER ierror = SET_U_GEO(value_index, value)`	Stores a value in the current user property buffer at a position referenced by `value_index`.

Specific functions for user's subroutines type sensor include:

Function	Variables		Description
`INTEGER NUM = GET_U_NUMSENS(ID)`	`ID`	Sensor ID	Allows you to get a sensor number.
`INTEGER NUM = GET_U_NUMSENS(ID)`	`NUM`	Sensor number	Allows you to get a sensor number.
`INTEGER ierror = GET_U_SENS_FPAR(IVAR, VAR)`	`IVAR`	Float variable index	Allows you to retrieve a float sensor parameter.
`INTEGER ierror = GET_U_SENS_FPAR(IVAR, VAR)`	`VAR`	Integer value	Allows you to retrieve a float sensor parameter.
`INTEGER ierror = GET_U_SENS_IPAR(IVAR, VAR)`	`IVAR`	Integer variable index	Allows you to retrieve an integer sensor parameter.
`INTEGER ierror = GET_U_SENS_IPAR(IVAR, VAR)`	`VAR`	Integer value	Allows you to retrieve an integer sensor parameter.
`INTEGER ierror = SET_U_SENS_VALUE(NSENS,IVAR,VAR)`	`NSENS`	Integer sensor number	Allows you to write a variable to a sensor buffer (float).
	`IVAR`	Integer buffer index
	`VAR`	Float value
`INTEGER ierror = GET_U_SENS_VALUE(NSENS,IVAR,VAR)`	`NSENS`	Integer sensor number	Allows you to read a variable from a sensor buffer (float).
	`IVAR`	Integer buffer index
	`VAR`	Float value
`INTEGER ierror = SET_U_SENS_ACTI(NSENS)`	`NSENS`	Integer sensor number	Allows you to activate a sensor using Radioss flag.
`FLOAT DTIME = GET_U_SENS_ACTI(NSENS)`	`DTIME`	Float time delay since first activation. `(actif < = > DTIME > 0)`	Allows you to check Radioss activation status of a sensor.
`FLOAT DTIME = GET_U_SENS_ACTI(NSENS)`	`NSENS`	Integer sensor number	Allows you to check Radioss activation status of a sensor.
`FLOAT TIME = GET_U_TIME()`			Allows you to check the current time.
`INTEGER NCYC = GET_U_CYCLE()`			Allows you to check the current cycle.
`INTEGER IERR = GET_U_ACCEL(NACC, AX,AY,AZ)`	`AX`, `AY`, `AZ`	Float acceleration components	Allows you to access accelerometer values.
	`NACC`	Integer accelerator number
	`IDACC`	Integer accelerator ID
	`NACC`	`GET_U_NUMACC(IDACC)`
`INTEGER IERR = GET_U_NOD_X(NOD, X,Y,Z)` `INTEGER IERR = GET_U_NOD_D(NOD, DX,DY,DZ)` `INTEGER IERR = GET_U_NOD_V(NOD, VX,VY,VZ)` `INTEGER IERR = GET_U_NOD_A(NOD, AX,AY,AZ)`	`X`, `Y`, `Z`	Float nodal coordinates	Allows you access to nodal values.
	`DX`, `DY`, `DZ`	Float nodal displacements
	`VX`, `VY`, `VZ`	Float nodal velocities
	`AX`, `AY`, `AZ`	Float nodal accelerations
	`NOD`	Integer node number
	`NID`	Integer node ID
	`NOD`	`GET_U_NUMNOD(ID)`
`FLOAT Y = GET_U_FUNC(IFUNC, X, DERI)`	`X`	Float ordinate	Allows you to access Radioss functions.
	`Y`	Float abscissa
	`DERI`	Float Y/X
	`IFUNC`	Integer function number
	`IDFUN`	Integer function ID, where `INTEGER IFUNC = GET_U_NUMFUN(IDFUN)`

Communication Between User's Modules and Radioss Database

Appendix 3 - General User's Subroutine Format with Material Laws 29, 30, and 31

Starter Format Example

Engine Format Example

Example Demo File

<install_directory>/hwsolvers/demos/radioss/User_Subroutines/7_appendix/appendix3/*

Appendix 4 - General User's Subroutine Format with Extended User Material Laws

Starter Format Example

Engine Format Example

Example Demo File

<install_directory>/hwsolvers/demos/radioss/User_Subroutines/7_appendix/appendix4/*