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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20# 1 "/home/runner/work/MFC/MFC/src/common/include/defaults/thermochem.fpp" 1
21! Default for Fypp runs outside the toolchain (e.g. documentation). Searched last, so the
22! build/include/<target>/thermochem.fpp the toolchain writes from m_thermochem takes precedence.
23# 4 "/home/runner/work/MFC/MFC/src/common/include/defaults/thermochem.fpp"
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45! New line at end of file is required for FYPP
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47# 1 "/home/runner/work/MFC/MFC/src/common/include/omp_macros.fpp" 1
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60# 1 "/home/runner/work/MFC/MFC/src/common/include/defaults/thermochem.fpp" 1
61! Default for Fypp runs outside the toolchain (e.g. documentation). Searched last, so the
62! build/include/<target>/thermochem.fpp the toolchain writes from m_thermochem takes precedence.
63# 4 "/home/runner/work/MFC/MFC/src/common/include/defaults/thermochem.fpp"
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166# 1 "/home/runner/work/MFC/MFC/src/common/include/acc_macros.fpp" 1
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179# 1 "/home/runner/work/MFC/MFC/src/common/include/defaults/thermochem.fpp" 1
180! Default for Fypp runs outside the toolchain (e.g. documentation). Searched last, so the
181! build/include/<target>/thermochem.fpp the toolchain writes from m_thermochem takes precedence.
182# 4 "/home/runner/work/MFC/MFC/src/common/include/defaults/thermochem.fpp"
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261# 311 "/home/runner/work/MFC/MFC/src/common/include/acc_macros.fpp"
262! New line at end of file is required for FYPP
263# 4 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp" 2
264
265! GPU parallel region (scalar reductions, maxval/minval)
266# 23 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
267
268! GPU parallel loop over threads (most common GPU macro)
269# 43 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
270
271! Required closing for GPU_PARALLEL_LOOP
272# 55 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
273
274! Mark routine for device compilation
275# 112 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
276
277! Declare device-resident data
278# 130 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
279
280! Inner loop within a GPU parallel region
281# 145 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
282
283! Scoped GPU data region
284# 164 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
285
286! Host code with device pointers (for MPI with GPU buffers)
287# 193 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
288
289! Allocate device memory (unscoped)
290# 207 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
291
292! Free device memory
293# 219 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
294
295! Atomic operation on device
296# 231 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
297
298! End atomic capture block
299# 242 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
300
301! Copy data between host and device
302# 254 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
303
304! Synchronization barrier
305# 266 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
306
307! Import GPU library module (openacc or omp_lib)
308# 275 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
309
310! Emit code only for AMD compiler
311# 282 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
312
313! Emit code for non-Cray compilers
314# 289 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
315
316! Emit code only for Cray compiler
317# 296 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
318
319! Emit code for non-NVIDIA compilers
320# 303 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
321
322# 305 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
323# 306 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
324! New line at end of file is required for FYPP
325# 2 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp" 2
326
327# 14 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
328
329! Caution: This macro requires the use of a binding script to set CUDA_VISIBLE_DEVICES, such that we have one GPU device per MPI
330! rank. That's because for both cudaMemAdvise (preferred location) and cudaMemPrefetchAsync we use location = device_id = 0. For an
331! example see misc/nvidia_uvm/bind.sh.
332# 52 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
333
334! Allocate and create GPU device memory
335# 72 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
336
337! Free GPU device memory and deallocate
338# 80 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
339
340! Cray-specific GPU pointer setup for vector fields
341# 104 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
342
343! Cray-specific GPU pointer setup for scalar fields
344# 120 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
345
346! Cray-specific GPU pointer setup for acoustic source spatials
347# 145 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
348
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351# 158 "/home/runner/work/MFC/MFC/src/common/include/macros.fpp"
352! New line at end of file is required for FYPP
353# 6 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp" 2
354
355!> @brief Herschel-Bulkley non-Newtonian viscosity: formula, shear rate, and mixture inverse-Re.
356module m_hb_function
357
358 use m_derived_types !< definitions of the derived types
359 use m_global_parameters !< re_size, re_idx, sgm_eps, dflt_real, any_non_newtonian, hb_* arrays
360 use m_constants !< verysmall
361
362 implicit none
363
364 private; public :: f_compute_hb_viscosity, f_compute_shear_rate_from_components, s_compute_mixture_inv_re
365
366contains
367
368 !> Papanastasiou-regularized Herschel-Bulkley viscosity.
369 function f_compute_hb_viscosity(tau0, K_val, nn_val, mu_min_val, mu_max_val, shear_rate, hb_m_val) result(mu)
370
371
372# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
373#if MFC_OpenACC
374# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
375!$acc routine seq
376# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
377#elif MFC_OpenMP
378# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
379
380# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
381
382# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
383!$omp declare target device_type(any)
384# 23 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
385#endif
386# 24 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
387
388 real(wp), intent(in) :: tau0, k_val, nn_val
389 real(wp), intent(in) :: mu_min_val, mu_max_val
390 real(wp), intent(in) :: shear_rate, hb_m_val
391 real(wp) :: mu
392 real(wp) :: yield_term, power_law_term, g_eff
393
394 g_eff = max(shear_rate, verysmall)
395 if (shear_rate <= verysmall) then
396 yield_term = tau0*hb_m_val
397 else
398 yield_term = tau0*(1._wp - exp(-hb_m_val*shear_rate))/shear_rate
399 end if
400 power_law_term = k_val*(g_eff**(nn_val - 1._wp))
401
402 mu = yield_term + power_law_term
403 if (mu_min_val > dflt_real) mu = max(mu, mu_min_val)
404 if (mu_max_val > dflt_real) mu = min(mu, mu_max_val)
405
406 end function f_compute_hb_viscosity
407
408 !> Shear rate gamma_dot = sqrt(2 D_ij D_ij). Absent dims pass 0.
409 function f_compute_shear_rate_from_components(D_xx, D_yy, D_zz, D_xy, D_xz, D_yz) result(shear_rate)
410
411
412# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
413#if MFC_OpenACC
414# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
415!$acc routine seq
416# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
417#elif MFC_OpenMP
418# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
419
420# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
421
422# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
423!$omp declare target device_type(any)
424# 48 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
425#endif
426# 49 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
427
428 real(wp), intent(in) :: d_xx, d_yy, d_zz, d_xy, d_xz, d_yz
429 real(wp) :: shear_rate
430
431 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)))
432
433 end function f_compute_shear_rate_from_components
434
435 !> Mixture inverse Reynolds (= 1/mu_mix) per direction (1=shear, 2=bulk) at one state. Newtonian fluids accumulate the legacy
436 !! per-fluid alpha/Res term. For non-Newtonian fluids only the shear direction (i==1) uses the Herschel-Bulkley viscosity at the
437 !! given shear rate; the bulk direction (i==2) contributes zero, since non-Newtonian bulk viscosity is not supported.
438 subroutine s_compute_mixture_inv_re(alpha, shear_rate, Res, Re_out)
439
440
441# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
442#if MFC_OpenACC
443# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
444!$acc routine seq
445# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
446#elif MFC_OpenMP
447# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
448
449# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
450
451# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
452!$omp declare target device_type(any)
453# 62 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
454#endif
455# 63 "/home/runner/work/MFC/MFC/src/simulation/m_hb_function.fpp"
456
457 real(wp), dimension(*), intent(in) :: alpha
458 real(wp), intent(in) :: shear_rate
459 real(wp), dimension(2,*), intent(in) :: res
460 real(wp), dimension(2), intent(out) :: re_out
461 integer :: i, q, fl
462 real(wp) :: mu_q
463
464 ! Plain serial loops: this is already a seq device routine, so no GPU_LOOP
465 ! directives (they emit empty on Cray/AMD and are redundant here).
466 do i = 1, 2
467 re_out(i) = dflt_real
468 if (re_size(i) > 0) re_out(i) = 0._wp
469 do q = 1, re_size(i)
470 fl = re_idx(i, q)
471 if (any_non_newtonian .and. is_non_newtonian(fl)) then
472 if (i == 1) then
473 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, &
474 & hb_m_arr(fl))
475 else
476 ! Non-Newtonian bulk viscosity is not supported (validator rejects mu_bulk and Re(2) for NN fluids)
477 mu_q = 0._wp
478 end if
479 re_out(i) = alpha(fl)*mu_q + re_out(i)
480 else
481 re_out(i) = alpha(fl)/res(i, q) + re_out(i)
482 end if
483 end do
484 re_out(i) = 1._wp/max(re_out(i), sgm_eps)
485 end do
486
487 end subroutine s_compute_mixture_inv_re
488
489end 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.f90:356
m_global_parameters
Global parameters for the computational domain, fluid properties, and simulation algorithm configurat...
Definition m_global_parameters.fpp.f90:367
m_global_parameters::any_non_newtonian
logical any_non_newtonian
.true. if any fluid is non-Newtonian
Definition m_global_parameters.fpp.f90:790
m_global_parameters::hb_tau0
real(wp), dimension(:), allocatable hb_tau0
Definition m_global_parameters.fpp.f90:792
m_global_parameters::hb_k
real(wp), dimension(:), allocatable hb_k
Definition m_global_parameters.fpp.f90:792
m_global_parameters::hb_nn
real(wp), dimension(:), allocatable hb_nn
Definition m_global_parameters.fpp.f90:792
m_global_parameters::hb_m_arr
real(wp), dimension(:), allocatable hb_m_arr
Definition m_global_parameters.fpp.f90:792
m_global_parameters::hb_mu_min
real(wp), dimension(:), allocatable hb_mu_min
Definition m_global_parameters.fpp.f90:793
m_global_parameters::hb_mu_max
real(wp), dimension(:), allocatable hb_mu_max
Definition m_global_parameters.fpp.f90:793
m_global_parameters::is_non_newtonian
logical, dimension(:), allocatable is_non_newtonian
per-fluid NN flag
Definition m_global_parameters.fpp.f90:791
m_hb_function
Herschel-Bulkley non-Newtonian viscosity: formula, shear rate, and mixture inverse-Re.
Definition m_hb_function.fpp.f90:356
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.f90:439
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.f90:410
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.f90:370