chrono::granular::ChGranParams Struct Reference
Description
Parameters needed for sphere-based granular dynamics.
This structure is stored in CUDA unified memory so that it can be accessed from both host and device
#include <ChGranular.h>
Public Attributes | |
| float | stepSize_SU |
| Timestep in SU. | |
| GRAN_FRICTION_MODE | friction_mode |
| Which friction mode is active for the simulation. | |
| GRAN_ROLLING_MODE | rolling_mode |
| Which rolling resistance model is active. | |
| GRAN_TIME_INTEGRATOR | time_integrator |
| Which time integrator is active. | |
| float | static_friction_coeff_s2s |
| Ratio of normal force to peak tangent force, also arctan(theta) where theta is the friction angle sphere-to-sphere. | |
| float | static_friction_coeff_s2w |
| Ratio of normal force to peak tangent force, also arctan(theta) where theta is the friction angle sphere-to-wall. | |
| float | rolling_coeff_s2s_SU |
| Coefficient of rolling resistance sphere-to-sphere. | |
| float | rolling_coeff_s2w_SU |
| Coefficient of rolling resistance sphere-to-wall. | |
| float | spinning_coeff_s2s_SU |
| Coefficient of spinning resistance sphere-to-sphere. | |
| float | spinning_coeff_s2w_SU |
| Coefficient of spinning resistance sphere-to-wall. | |
| float | Gamma_n_s2s_SU |
| sphere-to-sphere normal contact damping coefficient, expressed in SU | |
| float | Gamma_n_s2w_SU |
| sphere-to-wall normal contact damping coefficient, expressed in SU | |
| float | Gamma_t_s2s_SU |
| sphere-to-sphere tangent contact damping coefficient, expressed in SU | |
| float | Gamma_t_s2w_SU |
| sphere-to-wall tangent contact damping coefficient, expressed in SU | |
| float | K_n_s2s_SU |
| sphere-to-sphere normal contact stiffness, expressed in SU | |
| float | K_n_s2w_SU |
| sphere-to-wall normal contact stiffness, expressed in SU | |
| float | K_t_s2s_SU |
| sphere-to-sphere tangent contact stiffness, expressed in SU | |
| float | K_t_s2w_SU |
| sphere-to-wall tangent contact stiffness, expressed in SU | |
| unsigned int | sphereRadius_SU |
| Radius of the sphere, expressed in SU. | |
| float | sphereInertia_by_r |
| Moment of inertia of a sphere, normalized by the radius, expressed in SU. | |
| unsigned int | SD_size_X_SU |
| X-dimension of each subdomain box, expressed in SU. | |
| unsigned int | SD_size_Y_SU |
| Y-dimension of each subdomain box, expressed in SU. | |
| unsigned int | SD_size_Z_SU |
| Z-dimension of each subdomain box, expressed in SU. | |
| unsigned int | nSpheres |
| Total number of spheres in system, used for boundary condition multistep friction. | |
| unsigned int | nSDs |
| Total number of subdomains. | |
| unsigned int | nSDs_X |
| X-dimension of the big domain box in multiples of subdomains. | |
| unsigned int | nSDs_Y |
| Y-dimension of the big domain box in multiples of subdomains. | |
| unsigned int | nSDs_Z |
| Z-dimension of the big domain box in multiples of subdomains. | |
| int64_t | max_x_pos_unsigned |
| Maximum X dimension in the big domain frame. | |
| int64_t | max_y_pos_unsigned |
| Maximum Y dimension in the big domain frame. | |
| int64_t | max_z_pos_unsigned |
| Maximum Z dimension in the big domain frame. | |
| float | gravAcc_X_SU |
| X gravity in SU. | |
| float | gravAcc_Y_SU |
| Y gravity in SU. | |
| float | gravAcc_Z_SU |
| Z gravity in SU. | |
| int64_t | BD_frame_X |
| The bottom-left corner xPos of the big domain. | |
| int64_t | BD_frame_Y |
| The bottom-left corner yPos of the big domain. | |
| int64_t | BD_frame_Z |
| The bottom-left corner zPos of the big domain. | |
| int64_t | BD_offset_X |
| The offset of the big domain from its original frame, used to allow the subdomain definitions to move. | |
| int64_t | BD_offset_Y |
| The offset of the big domain from its original frame, used to allow the subdomain definitions to move. | |
| int64_t | BD_offset_Z |
| The offset of the big domain from its original frame, used to allow the subdomain definitions to move. | |
| float | cohesionAcc_s2s |
| Constant acceleration of sphere-to-sphere cohesion. | |
| float | adhesionAcc_s2w |
| Accleration of adhesion. | |
| double | LENGTH_UNIT |
| 1 / C_L. Any length expressed in SU is a multiple of LENGTH_UNIT | |
| double | TIME_UNIT |
| 1 / C_T. Any time quantity in SU is measured as a positive multiple of TIME_UNIT | |
| double | MASS_UNIT |
| 1 / C_M. Any mass quantity is measured as a positive multiple of MASS_UNIT. | |
| float | max_safe_vel = (float)UINT_MAX |
| Used as a safety check to determine whether a system has lost stability. | |
Static Public Attributes | |
| constexpr static float | sphere_mass_SU = 1.f |
| this is to make clear that the underlying assumption is unit SU mass | |
The documentation for this struct was generated from the following file:
- /builds/uwsbel/chrono/src/chrono_granular/physics/ChGranular.h
