diff --git a/doc/notebooks/05_tutorial_modifying_method_smagorinsky.ipynb b/doc/notebooks/05_tutorial_modifying_method_smagorinsky.ipynb
index 20e1653b9692f9488ad55a36113cf52d0e70be9c..6c2ff255e9826e28b1b5baebca6190c480a38996 100644
--- a/doc/notebooks/05_tutorial_modifying_method_smagorinsky.ipynb
+++ b/doc/notebooks/05_tutorial_modifying_method_smagorinsky.ipynb
@@ -419,7 +419,7 @@
],
"source": [
"method = create_lb_method(method='mrt', weighted=True, stencil='D2Q9', force=(1e-6, 0),\n",
- " relaxation_rates=[0, 0, ω, 1.9, 1.9])\n",
+ " force_model='luo', relaxation_rates=[0, 0, ω, 1.9, 1.9])\n",
"method"
]
},
diff --git a/doc/sphinx/lbmpy.bib b/doc/sphinx/lbmpy.bib
index 9620dc345ce71d66b4fca4719f64ea83f654732b..bceb010e1ee47c31a8109031f90491bcd5b818d0 100644
--- a/doc/sphinx/lbmpy.bib
+++ b/doc/sphinx/lbmpy.bib
@@ -41,6 +41,13 @@
publisher={APS}
}
+@phdthesis{schiller2008thermal,
+ title={Thermal fluctuations and boundary conditions in the lattice Boltzmann method},
+ author={Schiller, Ulf Daniel},
+ year={2008},
+ school={Johannes Gutenberg Universit{\"a}t Mainz}
+}
+
@article{Wohrwag2018,
archivePrefix = {arXiv},
diff --git a/lbmpy/forcemodels.py b/lbmpy/forcemodels.py
index 0b96e844434556d409471b10c0f15f1998bfb8b4..5b4a0b19b0db656b6c8c070f8d4eec54ca24a116 100644
--- a/lbmpy/forcemodels.py
+++ b/lbmpy/forcemodels.py
@@ -201,6 +201,7 @@ class Buick:
simple = Simple(self._force)
shear_relaxation_rate = get_shear_relaxation_rate(lb_method)
+ assert len(set(lb_method.relaxation_rates)) == 1, "Buick only works for SRT"
correction_factor = (1 - sp.Rational(1, 2) * shear_relaxation_rate)
return [correction_factor * t for t in simple(lb_method)]
diff --git a/lbmpy_tests/test_entropic.py b/lbmpy_tests/test_entropic.py
index 284570c1d4c874f8d11737a70346ade24ce94eba..47f6e841288e93f26037f5a38a29d2895f609de8 100644
--- a/lbmpy_tests/test_entropic.py
+++ b/lbmpy_tests/test_entropic.py
@@ -10,13 +10,13 @@ from lbmpy.stencils import get_stencil
def test_entropic_methods():
sc_kbc = create_lid_driven_cavity((20, 20), method='trt-kbc-n4', relaxation_rate=1.9999,
entropic_newton_iterations=3, entropic=True, compressible=True,
- force=(-1e-10, 0))
+ force=(-1e-10, 0), force_model="luo")
sc_srt = create_lid_driven_cavity((40, 40), relaxation_rate=1.9999, lid_velocity=0.05, compressible=True,
- force=(-1e-10, 0))
+ force=(-1e-10, 0), force_model="luo")
sc_entropic = create_lid_driven_cavity((40, 40), method='entropic-srt', relaxation_rate=1.9999,
- lid_velocity=0.05, compressible=True, force=(-1e-10, 0))
+ lid_velocity=0.05, compressible=True, force=(-1e-10, 0), force_model="luo")
sc_srt.run(1000)
sc_kbc.run(1000)
diff --git a/lbmpy_tests/test_fluctuation.py b/lbmpy_tests/test_fluctuation.py
index 63078aa12ef5373ae5d350f17c6143894c9a5f33..ded0db9149789bc95af08829a7e68b171752252e 100644
--- a/lbmpy_tests/test_fluctuation.py
+++ b/lbmpy_tests/test_fluctuation.py
@@ -5,7 +5,7 @@ from lbmpy.scenarios import create_channel
def test_fluctuating_generation_pipeline():
ch = create_channel((10, 10), stencil='D2Q9', method='mrt', weighted=True, relaxation_rates=[1.5] * 5, force=1e-5,
- fluctuating={'temperature': 1e-9}, kernel_params={'time_step': 1, 'seed': 312},
+ force_model='luo', fluctuating={'temperature': 1e-9}, kernel_params={'time_step': 1, 'seed': 312},
optimization={'cse_global': True})
ch.run(10)
diff --git a/lbmpy_tests/test_force.py b/lbmpy_tests/test_force.py
index 86d973f48b8d667a6f5dd3cc3dc194536f1a9db0..b42c03ebb214da089924a58073535b51060fa6d7 100644
--- a/lbmpy_tests/test_force.py
+++ b/lbmpy_tests/test_force.py
@@ -1,9 +1,11 @@
from pystencils.session import *
from lbmpy.session import *
from lbmpy.macroscopic_value_kernels import macroscopic_values_setter
-import pytest
import lbmpy.forcemodels
+import pytest
+from contextlib import ExitStack as does_not_raise
+
force_models = [fm.lower() for fm in dir(lbmpy.forcemodels) if fm[0].isupper()]
@@ -25,14 +27,22 @@ def test_total_momentum(method, force_model, omega):
Ï = dh.add_array('rho')
u = dh.add_array('u', values_per_cell=dh.dim)
- collision = create_lb_update_rule(method=method,
- stencil=stencil,
- relaxation_rate=omega,
- compressible=True,
- force_model=force_model,
- force=F,
- kernel_type='collide_only',
- optimization={'symbolic_field': src})
+ expectation = does_not_raise()
+ skip = False
+ if force_model in ['guo', 'buick'] and method != 'srt':
+ expectation = pytest.raises(AssertionError)
+ skip = True
+ with expectation:
+ collision = create_lb_update_rule(method=method,
+ stencil=stencil,
+ relaxation_rate=omega,
+ compressible=True,
+ force_model=force_model,
+ force=F,
+ kernel_type='collide_only',
+ optimization={'symbolic_field': src})
+ if skip:
+ return
stream = create_stream_pull_with_output_kernel(collision.method, src, dst,
{'density': Ï, 'velocity': u})
diff --git a/lbmpy_tests/test_split_optimization.py b/lbmpy_tests/test_split_optimization.py
index 821d6868f5dfbddc7e09aeb29a12643729c8133f..2e0b744191eb4c8c477f2ccb6617807d604ce1bf 100644
--- a/lbmpy_tests/test_split_optimization.py
+++ b/lbmpy_tests/test_split_optimization.py
@@ -16,6 +16,7 @@ def test_split_number_of_operations():
common_params = {'stencil': stencil,
'method': method,
'compressible': compressible,
+ 'force_model': 'luo',
'force': (1e-6, 1e-5, 1e-7)
}
ast_with_splitting = create_lb_ast(optimization={'split': True}, **common_params)
diff --git a/lbmpy_tests/test_srt_trt_simplifications.py b/lbmpy_tests/test_srt_trt_simplifications.py
index 0d154edab4b016b2510cb04770d7adcd8bc8fdb6..eb799d4484ab538eaac3f6d2a26c67b2ca0539e6 100644
--- a/lbmpy_tests/test_srt_trt_simplifications.py
+++ b/lbmpy_tests/test_srt_trt_simplifications.py
@@ -4,7 +4,7 @@ known acceptable values.
"""
import sympy as sp
-from lbmpy.forcemodels import Guo
+from lbmpy.forcemodels import Luo
from lbmpy.methods import create_srt, create_trt, create_trt_with_magic_number
from lbmpy.methods.momentbasedsimplifications import cse_in_opposing_directions
from lbmpy.simplificationfactory import create_simplification_strategy
@@ -55,13 +55,13 @@ def test_simplifications_trt_d2q9_compressible():
def test_simplifications_trt_d3q19_force_incompressible():
o1, o2 = sp.symbols("omega_1 omega_2")
- force_model = Guo([sp.Rational(1, 3), sp.Rational(1, 2), sp.Rational(1, 5)])
+ force_model = Luo([sp.Rational(1, 3), sp.Rational(1, 2), sp.Rational(1, 5)])
method = create_trt(get_stencil("D3Q19"), o1, o2, compressible=False, force_model=force_model)
check_method(method, [268, 281, 0], [241, 175, 1])
def test_simplifications_trt_d3q19_force_compressible():
o1, o2 = sp.symbols("omega_1 omega_2")
- force_model = Guo([sp.Rational(1, 3), sp.Rational(1, 2), sp.Rational(1, 5)])
+ force_model = Luo([sp.Rational(1, 3), sp.Rational(1, 2), sp.Rational(1, 5)])
method = create_trt_with_magic_number(get_stencil("D3Q19"), o1, compressible=False, force_model=force_model)
check_method(method, [270, 283, 1], [243, 177, 1])