MFC
Exascale flow solver
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m_hb_function.fpp.f90
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1# 1 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
2!>
3!! @file m_hb_function.f90
4!! @brief Herschel-Bulkley non-Newtonian viscosity: formula, shear rate, and mixture inverse-Re.
5
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241! New line at end of file is required for FYPP
242# 4 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp" 2
243
244! GPU parallel region (scalar reductions, maxval/minval)
245# 23 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
246
247! GPU parallel loop over threads (most common GPU macro)
248# 43 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
249
250! Required closing for GPU_PARALLEL_LOOP
251# 55 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
252
253! Mark routine for device compilation
254# 112 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
255
256! Declare device-resident data
257# 130 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
258
259! Inner loop within a GPU parallel region
260# 145 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
261
262! Scoped GPU data region
263# 164 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
264
265! Host code with device pointers (for MPI with GPU buffers)
266# 193 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
267
268! Allocate device memory (unscoped)
269# 207 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
270
271! Free device memory
272# 219 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
273
274! Atomic operation on device
275# 231 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
276
277! End atomic capture block
278# 242 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
279
280! Copy data between host and device
281# 254 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
282
283! Synchronization barrier
284# 266 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
285
286! Import GPU library module (openacc or omp_lib)
287# 275 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
288
289! Emit code only for AMD compiler
290# 282 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
291
292! Emit code for non-Cray compilers
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294
295! Emit code only for Cray compiler
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298! Emit code for non-NVIDIA compilers
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306# 14 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
307
308! Caution: This macro requires the use of a binding script to set CUDA_VISIBLE_DEVICES, such that we have one GPU device per MPI
309! rank. That's because for both cudaMemAdvise (preferred location) and cudaMemPrefetchAsync we use location = device_id = 0. For an
310! example see misc/nvidia_uvm/bind.sh.
311# 52 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
312
313! Allocate and create GPU device memory
314# 72 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
315
316! Free GPU device memory and deallocate
317# 80 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
318
319! Cray-specific GPU pointer setup for vector fields
320# 104 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
321
322! Cray-specific GPU pointer setup for scalar fields
323# 120 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
324
325! Cray-specific GPU pointer setup for acoustic source spatials
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332# 6 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp" 2
333
334!> @brief Herschel-Bulkley non-Newtonian viscosity: formula, shear rate, and mixture inverse-Re.
335module m_hb_function
336
337 use m_derived_types !< definitions of the derived types
338 use m_global_parameters !< re_size, re_idx, sgm_eps, dflt_real, any_non_newtonian, hb_* arrays
339 use m_constants !< verysmall
340
341 implicit none
342
343 private; public :: f_compute_hb_viscosity, f_compute_shear_rate_from_components, s_compute_mixture_inv_re
344
345contains
346
347 !> Papanastasiou-regularized Herschel-Bulkley viscosity.
348 function f_compute_hb_viscosity(tau0, K_val, nn_val, mu_min_val, mu_max_val, shear_rate, hb_m_val) result(mu)
349
350
351# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
352#if MFC_OpenACC
353# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
354!$acc routine seq
355# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
356#elif MFC_OpenMP
357# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
358
359# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
360
361# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
362!$omp declare target device_type(any)
363# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
364#endif
365
366 real(wp), intent(in) :: tau0, k_val, nn_val
367 real(wp), intent(in) :: mu_min_val, mu_max_val
368 real(wp), intent(in) :: shear_rate, hb_m_val
369 real(wp) :: mu
370 real(wp) :: yield_term, power_law_term, g_eff
371
372 g_eff = max(shear_rate, verysmall)
373 if (shear_rate <= verysmall) then
374 yield_term = tau0*hb_m_val
375 else
376 yield_term = tau0*(1._wp - exp(-hb_m_val*shear_rate))/shear_rate
377 end if
378 power_law_term = k_val*(g_eff**(nn_val - 1._wp))
379
380 mu = yield_term + power_law_term
381 if (mu_min_val > dflt_real) mu = max(mu, mu_min_val)
382 if (mu_max_val > dflt_real) mu = min(mu, mu_max_val)
383
384 end function f_compute_hb_viscosity
385
386 !> Shear rate gamma_dot = sqrt(2 D_ij D_ij). Absent dims pass 0.
387 function f_compute_shear_rate_from_components(D_xx, D_yy, D_zz, D_xy, D_xz, D_yz) result(shear_rate)
388
389
390# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
391#if MFC_OpenACC
392# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
393!$acc routine seq
394# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
395#elif MFC_OpenMP
396# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
397
398# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
399
400# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
401!$omp declare target device_type(any)
402# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
403#endif
404
405 real(wp), intent(in) :: d_xx, d_yy, d_zz, d_xy, d_xz, d_yz
406 real(wp) :: shear_rate
407
408 shear_rate = sqrt(2._wp*(d_xx*d_xx + d_yy*d_yy + d_zz*d_zz + 2._wp*(d_xy*d_xy + d_xz*d_xz + d_yz*d_yz)))
409
410 end function f_compute_shear_rate_from_components
411
412 !> Mixture inverse Reynolds (= 1/mu_mix) per direction (1=shear, 2=bulk) at one state. Newtonian fluids accumulate the legacy
413 !! per-fluid alpha/Res term. For non-Newtonian fluids only the shear direction (i==1) uses the Herschel-Bulkley viscosity at the
414 !! given shear rate; the bulk direction (i==2) contributes zero, since non-Newtonian bulk viscosity is not supported.
415 subroutine s_compute_mixture_inv_re(alpha, shear_rate, Res, Re_out)
416
417
418# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
419#if MFC_OpenACC
420# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
421!$acc routine seq
422# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
423#elif MFC_OpenMP
424# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
425
426# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
427
428# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
429!$omp declare target device_type(any)
430# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
431#endif
432
433 real(wp), dimension(*), intent(in) :: alpha
434 real(wp), intent(in) :: shear_rate
435 real(wp), dimension(2,*), intent(in) :: res
436 real(wp), dimension(2), intent(out) :: re_out
437 integer :: i, q, fl
438 real(wp) :: mu_q
439
440 ! Plain serial loops: this is already a seq device routine, so no GPU_LOOP
441 ! directives (they emit empty on Cray/AMD and are redundant here).
442 do i = 1, 2
443 re_out(i) = dflt_real
444 if (re_size(i) > 0) re_out(i) = 0._wp
445 do q = 1, re_size(i)
446 fl = re_idx(i, q)
447 if (any_non_newtonian .and. is_non_newtonian(fl)) then
448 if (i == 1) then
449 mu_q = f_compute_hb_viscosity(hb_tau0(fl), hb_k(fl), hb_nn(fl), hb_mu_min(fl), hb_mu_max(fl), shear_rate, &
450 & hb_m_arr(fl))
451 else
452 ! Non-Newtonian bulk viscosity is not supported (validator rejects mu_bulk and Re(2) for NN fluids)
453 mu_q = 0._wp
454 end if
455 re_out(i) = alpha(fl)*mu_q + re_out(i)
456 else
457 re_out(i) = alpha(fl)/res(i, q) + re_out(i)
458 end if
459 end do
460 re_out(i) = 1._wp/max(re_out(i), sgm_eps)
461 end do
462
463 end subroutine s_compute_mixture_inv_re
464
465end module m_hb_function
m_constants
Compile-time constant parameters: default values, tolerances, and physical constants.
Definition m_constants.fpp.f90:7
m_constants::sgm_eps
real(wp), parameter sgm_eps
Segmentation tolerance.
Definition m_constants.fpp.f90:13
m_constants::dflt_real
real(wp), parameter dflt_real
Default real value.
Definition m_constants.fpp.f90:12
m_constants::verysmall
real(wp), parameter verysmall
Very small number.
Definition m_constants.fpp.f90:17
m_derived_types
Shared derived types for field data, patch geometry, bubble dynamics, and MPI I/O structures.
Definition m_derived_types.fpp.f90:335
m_global_parameters
Global parameters for the computational domain, fluid properties, and simulation algorithm configurat...
Definition m_global_parameters.fpp.f90:346
m_global_parameters::any_non_newtonian
logical any_non_newtonian
.true. if any fluid is non-Newtonian
Definition m_global_parameters.fpp.f90:745
m_global_parameters::hb_tau0
real(wp), dimension(:), allocatable hb_tau0
Definition m_global_parameters.fpp.f90:747
m_global_parameters::hb_k
real(wp), dimension(:), allocatable hb_k
Definition m_global_parameters.fpp.f90:747
m_global_parameters::hb_nn
real(wp), dimension(:), allocatable hb_nn
Definition m_global_parameters.fpp.f90:747
m_global_parameters::hb_m_arr
real(wp), dimension(:), allocatable hb_m_arr
Definition m_global_parameters.fpp.f90:747
m_global_parameters::hb_mu_min
real(wp), dimension(:), allocatable hb_mu_min
Definition m_global_parameters.fpp.f90:748
m_global_parameters::hb_mu_max
real(wp), dimension(:), allocatable hb_mu_max
Definition m_global_parameters.fpp.f90:748
m_global_parameters::is_non_newtonian
logical, dimension(:), allocatable is_non_newtonian
per-fluid NN flag
Definition m_global_parameters.fpp.f90:746
m_hb_function
Herschel-Bulkley non-Newtonian viscosity: formula, shear rate, and mixture inverse-Re.
Definition m_hb_function.fpp.f90:335
m_hb_function::s_compute_mixture_inv_re
subroutine, public s_compute_mixture_inv_re(alpha, shear_rate, res, re_out)
Mixture inverse Reynolds (= 1/mu_mix) per direction (1=shear, 2=bulk) at one state....
Definition m_hb_function.fpp.f90:416
m_hb_function::f_compute_shear_rate_from_components
real(wp) function, public f_compute_shear_rate_from_components(d_xx, d_yy, d_zz, d_xy, d_xz, d_yz)
Shear rate gamma_dot = sqrt(2 D_ij D_ij). Absent dims pass 0.
Definition m_hb_function.fpp.f90:388
m_hb_function::f_compute_hb_viscosity
real(wp) function, public f_compute_hb_viscosity(tau0, k_val, nn_val, mu_min_val, mu_max_val, shear_rate, hb_m_val)
Papanastasiou-regularized Herschel-Bulkley viscosity.
Definition m_hb_function.fpp.f90:349