• Compa e a ious geome ies o selec he op imal
con igu a ions wi h espec o o e opping o a wa e-
ene gy con e e .
• P edic pe o mance unde eal-wo ld condi ions o
he amp.
• Compa e he e ec o po osi y on he li o ces ac ing
on he amp.
• Visualize he eloci y ields and compa e he esul s
wi h hose om ano he so wa e.
• De ining a wa e ene gy spec um as a bounda y condi ion should be done ca e ully o
a oid inco ec simula ions. I is sugges ed o emo e sho -wa e componen s om he
ene gy spec um, as hese sho e wa eleng hs canno be p ope ly esol ed by he
code.
Modeling he geome y o he o e opping amp and he A chimedes sc ew u bine o a
wa e-ene gy con e e .
Saeed OSOULI1,2, Ma eo POSTACCHINI1, I an SABBIONI2, Mau izio BROCCHINI1
1Depa men o Ingegne ia Ci ile, Edile e A chi e u a, Uni e si à Poli ecnica delle Ma che, Ancona, I aly
2 Men ucci Aldo Cos uzioni, Senigallia, I aly
Fig.1 – A nume ical simula ion es ima ing wa e o ces on a pla e in a po ous s uc u e (le ) and he
geome ies used o simula e he u bine and amp in FLOW-3D
Nume ical Se ups (Figs.2 and 3)
•2D-Wa e lume:72𝑚 × 1𝑚 × 10𝑚
• Di e en on al slopes.
• Wa e cha ac e is ics based on ene gy spec um 𝐻𝑠, 𝑇, ℎ = 1 𝑚, 7𝑠, 6𝑚
• 3 ene gy spec ums wi h di e en angula equencies.
•The se up ollows Zi i e al. (2020) bu di e s in he op bounda y condi ion.
• The low eloci y was se o 0.2 m/s in a ee-su ace wa e channel.
• P esc ibed mo ions we e imposed on he u bine.
A chimedes Tu bineA chimedes Tu bine
Wa e ene gy
con e e
Wa e ene gy
con e e
Tu bulence Models and Size o Cells
Two Tu bulence T anspo Models:
RNG k-epsilon o he WEC
k-omega o he Tu bine
0.05 m in x and z di ec ion o WEC
2 mesh blocks o he Tu bine,
uni o mly 0.01 and 0.005 m.
Me hodology
Inspi a ion and mo i a ions
Resul s
E ec o inpu Spec um and Ramp slope
Sho -wa e componen s in he ene gy spec um esul in a la ge o e opping
olume (Figs. 4a and 4b). Based on es ima es om he Eu O op manual and
Iuppa e al. (2019), his se up should yield less han 2 m³, he closes
obse ed alue is 2.95 m³ o Model 1. This ene gy model includes only wa es
wi h equencies up o 0.3 Hz. A 26° slope p oduces he highes o e opping
olume (Fig. 4c).
Fig.2 – Mesh
blocks o Tu bine
( op) and WEC’s
BCs (bo om)
Re e ences
Eu o op, J.W. an de Mee , N.W.H. Allsop, T. B uce, A. Ko enhaus, , T. Pullen, H.
Schü ump , (Eds.), 2018 Assessmen Manual www.o e opping-manual.com.
Iuppa, C., Ca alla o, L., Musumeci, R. E., Vicinanza, D., & Fo i, E. (2019). Empi ical
o e opping olume s a is ics a an OBREC. Coas al Enginee ing, 152, 103524.
h ps://doi.o g/10.1016/j.coas aleng.2019.103524
Zi i, G., Fa o e, F., B uno i, A., B uno i, B., & B occhini, M. (2020). E iciency e alua ion o a
duc less A chimedes u bine: Labo a o y expe imen s and nume ical simula ions.
Renewable Ene gy, 146, 867–879.
Fig.3 –Ene gy
Spec ums
All ha e he same
Wa e
cha ac e is ics:
he spec al peaks
and he a ea unde
he spec um a e
nea ly iden ical, bu
hey co e di e en
wa e pe iods.
Conclusions
Fig.4 – a) wa e olume. b) ee su ace a 30m om he oe. c) di e en slopes wi h Model 1 as inpu .
Wa e o ce on di e en condi ions
Fig.6 illus a es he e ec o po osi y. While
shea and li o ces a e negligible in he solid
con igu a ion (Righ ), in oducing a olume ic
po osi y o 0.5 leads o a sha p inc ease in bo h
li and shea o ces (Le ).
Fig.5 –Tu bine o que
compa ison: Zi i e al. ( op) s.
cu en s udy (bo om).
Tu bine pe o mance
In Fig. 5, a compa ison be ween FLOW-3D and ANSYS Fluen is p esen ed. In bo h
so wa e packages, inc easing he o a ion speed dec eases he o que; howe e , FLOW-3D
exhibi s la ge oscilla ions. This beha iou may be due o di e ences in nume ical app oach,
cell ype/size, and he bounda y condi ions applied a he ee su ace.
P obes
Wa e make
P essu e
Wall
(a) (b) (c)
Fig.6 –Wa e o ce on a amp in a po ous
s uc u e (Le ) and solid (Righ ).
0.005 m cells
0.01 m cells
Con ey sys ems wi h Tu bines
