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Addition of 2D vortex particle methods
Includes refactoring to avoid name collisions with 3D vortex particle methods, and updates to method names to better reflect new naming schemes.
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,138 @@ | ||
| #include "libcvtx.h" | ||
| /*============================================================================ | ||
| P2D.c | ||
| Vortex particle in 2D with CPU based code. | ||
| Copyright(c) 2019 HJA Bird | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files(the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions : | ||
| The above copyright notice and this permission notice shall be included in all | ||
| copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| SOFTWARE. | ||
| ============================================================================*/ | ||
|
|
||
| #include <assert.h> | ||
| #include <math.h> | ||
| #include <stddef.h> | ||
|
|
||
| #ifdef CVTX_USING_OPENCL | ||
| # include "ocl_P2D.h" | ||
| #endif | ||
|
|
||
| /* The induced velocity for a particle excluding the constant | ||
| coefficient 1 / 4pi */ | ||
| inline bsv_V2f P2D_vel_inner( | ||
| const cvtx_P2D * self, | ||
| const bsv_V2f mes_point, | ||
| const cvtx_VortFunc * kernel, | ||
| float recip_reg_rad) | ||
| { | ||
| bsv_V2f rad, ret; | ||
| float radd, rho, g; | ||
| if (bsv_V2f_isequal(self->coord, mes_point)) { | ||
| ret = bsv_V2f_zero(); | ||
| } | ||
| else { | ||
| rad = bsv_V2f_minus(mes_point, self->coord); | ||
| radd = bsv_V2f_abs(rad); | ||
| rho = radd * recip_reg_rad; | ||
| g = -kernel->g_2D(rho); | ||
| ret.x[0] = rad.x[1] * self->vorticity * g / (radd * radd); | ||
| ret.x[1] = -rad.x[0] * self->vorticity * g / (radd * radd); | ||
| } | ||
| return ret; | ||
| } | ||
|
|
||
| CVTX_EXPORT bsv_V2f cvtx_P2D_S2S_vel( | ||
| const cvtx_P2D * self, | ||
| const bsv_V2f mes_point, | ||
| const cvtx_VortFunc * kernel, | ||
| float regularisation_radius) | ||
| { | ||
| bsv_V2f ret; | ||
| ret = P2D_vel_inner(self, mes_point, kernel, | ||
| 1.f / fabsf(regularisation_radius)); | ||
| return bsv_V2f_mult(ret, -1.f / (2.f * acosf(-1.f))); | ||
| } | ||
|
|
||
| CVTX_EXPORT bsv_V2f cvtx_P2D_M2S_vel( | ||
| const cvtx_P2D **array_start, | ||
| const int num_particles, | ||
| const bsv_V2f mes_point, | ||
| const cvtx_VortFunc *kernel, | ||
| float regularisation_radius) | ||
| { | ||
| double rx = 0, ry = 0; | ||
| long i; | ||
| float recip_reg_rad = 1.f / fabsf(regularisation_radius); | ||
| assert(num_particles >= 0); | ||
| #pragma omp parallel for reduction(+:rx, ry) | ||
| for (i = 0; i < num_particles; ++i) { | ||
| bsv_V2f vel = P2D_vel_inner(array_start[i], | ||
| mes_point, kernel, recip_reg_rad); | ||
| rx += vel.x[0]; | ||
| ry += vel.x[1]; | ||
| } | ||
| bsv_V2f ret = { (float)rx, (float)ry }; | ||
| return bsv_V2f_mult(ret, -1.f / (2.f * acosf(-1.f))); | ||
| } | ||
|
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|
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||
| static void cpu_brute_force_P2D_M2M_vel( | ||
| const cvtx_P2D **array_start, | ||
| const int num_particles, | ||
| const bsv_V2f *mes_start, | ||
| const int num_mes, | ||
| bsv_V2f *result_array, | ||
| const cvtx_VortFunc *kernel, | ||
| float regularisation_radius) | ||
| { | ||
| long i; | ||
| #pragma omp parallel for schedule(static) | ||
| for (i = 0; i < num_mes; ++i) { | ||
| result_array[i] = cvtx_P2D_M2S_vel( | ||
| array_start, num_particles, mes_start[i], | ||
| kernel, regularisation_radius); | ||
| } | ||
| return; | ||
| } | ||
|
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||
| CVTX_EXPORT void cvtx_P2D_M2M_vel( | ||
| const cvtx_P2D **array_start, | ||
| const int num_particles, | ||
| const bsv_V2f *mes_start, | ||
| const int num_mes, | ||
| bsv_V2f *result_array, | ||
| const cvtx_VortFunc *kernel, | ||
| float regularisation_radius) | ||
| { | ||
| #ifdef CVTX_USING_OPENCL | ||
| if (num_particles < 256 | ||
| || num_mes < 256 | ||
| || kernel->cl_kernel_name_ext == "" | ||
| || opencl_brute_force_P2D_M2M_vel( | ||
| array_start, num_particles, mes_start, | ||
| num_mes, result_array, kernel, regularisation_radius) != 0) | ||
| #endif | ||
| { | ||
| cpu_brute_force_P2D_M2M_vel( | ||
| array_start, num_particles, mes_start, | ||
| num_mes, result_array, kernel, regularisation_radius); | ||
| } | ||
| return; | ||
| } | ||
|
|
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