Harmonic
[Force Calculation]

Functions
__device__ void	gpuAddHarmonicBondForce (FLOAT_ARRAY_TYPE *dForce, FLOAT_ARRAY_TYPE *dA, FLOAT_ARRAY_TYPE *dB, float *dK, float *boxsize)
	Add harmonic force to one particle.
__global__ void	gpuHarmonicBondForces (FLOAT_ARRAY_TYPE *dPos, FLOAT_ARRAY_TYPE *dForce, int *cnn, size_t pitch, int N, int numNN, float k, float boxsize)
	Harmonic force calculation kernel.
__global__ void	gpuHarmonicBondForcesSmem (FLOAT_ARRAY_TYPE *dPos, FLOAT_ARRAY_TYPE *dForce, int *cnn, size_t pitch, int N, int numNN, float k, float boxsize)
	Harmonic force calculation kernel using shared memory.

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Detailed Description

This module contains functions to compute harmonic forces.

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Function Documentation

__device__ void gpuAddHarmonicBondForce	(	FLOAT_ARRAY_TYPE *	dForce,
		FLOAT_ARRAY_TYPE *	dA,
		FLOAT_ARRAY_TYPE *	dB,
		float *	dK,
		float *	boxsize
	)

This function computes the harmonic interaction force of two particles.

Parameters:

[out]	dForce	Force contribution to particle a due to harmonic interaction with particle b
[in]	dA	Position in device memory of particle a
[in]	dB	Position in device memory of particleb
[in]	dK	Spring constant
[in]	boxsize	Edge length of the cubic simulation box.

Returns:

Returns CUDA error information.

Definition at line 58 of file gpu_forces.cu.

References FLOAT_ARRAY_TYPE, and gpuDistPBC().

Referenced by gpuHarmonicBondForces(), and gpuHarmonicBondForcesSmem().

__global__ void gpuHarmonicBondForces	(	FLOAT_ARRAY_TYPE *	dPos,
		FLOAT_ARRAY_TYPE *	dForce,
		int *	cnn,
		size_t	pitch,
		int	N,
		int	numNN,
		float	k,
		float	boxsize
	)

The harmonic force on each particle is calculated by storing the coordinates of the reference particle in a register and fetching the coordinates of the interaction partners directly from global memory.

Parameters:

[in]	dPos	Array of all particle positions
[in,out]	dForce	Array of all forces
[in]	cnn	Array holding in each column the harmonic interaction partners for one particle
[in]	pitch	Pitch value for accessing the cnn array via CUDA in the right way.
[in]	N	Number of particle
[in]	numNN	Maximum number of harmonic interaction partners for each particle
[in]	k	Spring constant
[in]	boxsize	Edge length of the cubic simulation box

Returns:

Returns CUDA error information.

Definition at line 422 of file gpu_forces.cu.

References FLOAT_ARRAY_TYPE, and gpuAddHarmonicBondForce().

__global__ void gpuHarmonicBondForcesSmem	(	FLOAT_ARRAY_TYPE *	dPos,
		FLOAT_ARRAY_TYPE *	dForce,
		int *	cnn,
		size_t	pitch,
		int	N,
		int	numNN,
		float	k,
		float	boxsize
	)

The harmonic force on each particle is calculated by storing the coordinates of the reference particle in shared memory and fetching the coordinates of the interaction partners directly from global memory.

Parameters:

[in]	dPos	Array of all particle positions
[in,out]	dForce	Array of all forces
[in]	cnn	Array holding in each column the harmonic interaction partners for one particle
[in]	pitch	Pitch value for accessing the cnn array via CUDA in the right way.
[in]	N	Number of particle
[in]	numNN	Maximum number of harmonic interaction partners for each particle
[in]	k	Spring constant
[in]	boxsize	Edge length of the cubic simulation box

Returns:

Returns CUDA error information.

Definition at line 443 of file gpu_forces.cu.

References FLOAT_ARRAY_TYPE, and gpuAddHarmonicBondForce().