Wave Attenuation in Flume

lhanley222lhanley222
in DualSPHysics v5.0

Hi There,

I'm running an experiment studying wave attenuation through oyster growing cages. Part of the study is using a SPH simulation to look at wave attenuation. I've created a "flume" similar to the examples. Immediately, what I'm seeing is too much wave attenuation. I investigated further, and am seeing that even in an empty flume, I have wave heights decreasing across the domain. I'm unsure of the cause of this. I have a sloped beach at the end of my domain, but I'm not seeing major distortion from reflection. I've attached a paraview snapshot of my domain below.

forum1.PNG

I'm running at a dpi of .02m, and using a piston wavemaker with irregular waves. I'm quantifying attenuation using a wave spectrum at the first and last gauges, and seeing about 70% of wave energy dissipated in an empty flume. I'm using the MDBC. Does anyone have any suggestions?

TLDR; I expect to see little to no change in waves across flume, but am seeing waves decrease in energy.

Comments

  • lhanley222lhanley222

    I realize my issue is the same at the one described here:

    This is an embed external element. It can be deleted using the delete key or the backspace key. To view the full element, press the preview button below.

    Waveheight attenuation phenomenon

    wzl

    Hello everyone.

    I was trying to verify the stability of waveheight along the x-axis. So I changed the length of wave tank to 70 meters in CasePistonBeach_REG and CasePistonDamping_REG from DualSPHysics_v5.0\examples\main\09_WavesPiston. Both cases show waveheight attenuation phenomenon along the x-axis.

    https://forums.dual.sphysics.org/uploads/432/FSUNLS1XZ6NM.png

    https://forums.dual.sphysics.org/uploads/128/WXRA8XBNS80I.png

    I tried to change coefh to 1.5 and dp to 0.01. The result is much better,but the attenuation still exists.

    I want to know what causes the attenuation and how to eliminate it.

    Thank you!

    So i will follow these suggestions and see if there is improvement.

  • Asalih3dAsalih3d

    Awesome!

    Let us know, then we can help hopefully

    I think AWAS would do wonders here. Some wave attenuation is properly to be expected still.

    Kind regards

  • lhanley222lhanley222

    Thank you!

    This is an embed external element. It can be deleted using the delete key or the backspace key. To view the full element, press the preview button below.
    Asalih3d

    Awesome!

    Let us know, then we can help hopefully

    I think AWAS would do wonders here. Some wave attenuation is properly to be expected still.

    Kind regards

    Right now I have implemented all suggestions but AWAS and am seeing about 90% attenuation. This is much better than before. I'm now running one with AWAS and will see those results in the morning

  • AlexAlex

    Let us start with a reminder: SPH method is not designed to study wave propagation or wave attenuation, it is a method to study wave-structure interaction.

    IN addition, we can propagate waves... yes... but standard SPH formulation can only propagate waves without wave decay for 2-3 wavelenghts maximum... using more sophisticated formulations such as delta-SPH can allow you to propagate waves better and longer.... and of course, other approaches as using Riemann Solver implementations can avoid this problem.


    In the case of DualSPHysics using a proper viscosity treatment with DDT Fourtakas can help to propage waves perfectly for more than 3 wavelenghts


    Regards

  • GWAVEGWAVE

    I can confirm that the suggestions posted in the thread below do in fact work. I'm running waves in a flume about 45m long and see very little attenuation. I don't use mDBC or AWAS in my simulation. In addition, be sure your particle spacing is about 1/10 the wave amplitude.

    This is an embed external element. It can be deleted using the delete key or the backspace key. To view the full element, press the preview button below.
    lhanley222

    I realize my issue is the same at the one described here:

    https://forums.dual.sphysics.org/discussion/2248/waveheight-attenuation-phenomenon

    So i will follow these suggestions and see if there is improvement.


  • AlexAlex

    In addition, using coefh=1.2 or higher will also help to propagate waves for 3 wavelengths at least

    Regards

Sign In or Register to comment.

Debug Trace

Notice 
rich is deprecated. Use FormatService::renderHtml($content, Formats\RichFormat::FORMAT_KEY) instead.

#0 [internal function]: gdn_ErrorHandler(16384, 'rich is depreca...', '/var/www/forums...', 950, Array)
#1 /var/www/forums-dual-sphysics-org/library/core/functions.general.php(950): trigger_error('rich is depreca...', 16384)
#2 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1729): deprecated('rich', 'FormatService::...')
#3 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1479): Gdn_Format::rich('[{"insert":"Hi ...')
#4 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(197): Gdn_Format::to('[{"insert":"Hi ...', 'Rich')
#5 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(402): DiscussionController->index(2494, 'x', 'p1')
#6 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('5689')
#7 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(279): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array)
#8 /var/www/forums-dual-sphysics-org/index.php(29): Gdn_Dispatcher->dispatch()
#9 {main}
Notice 
rich is deprecated. Use FormatService::renderHtml($content, Formats\RichFormat::FORMAT_KEY) instead.

#0 [internal function]: gdn_ErrorHandler(16384, 'rich is depreca...', '/var/www/forums...', 950, Array)
#1 /var/www/forums-dual-sphysics-org/library/core/functions.general.php(950): trigger_error('rich is depreca...', 16384)
#2 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1729): deprecated('rich', 'FormatService::...')
#3 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1479): Gdn_Format::rich('[{"insert":"Hi ...')
#4 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(24): Gdn_Format::to('[{"insert":"Hi ...', 'Rich')
#5 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/discussion.php(89): formatBody(Object(stdClass))
#6 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/index.php(31): include('/var/www/forums...')
#7 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(778): include('/var/www/forums...')
#8 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(1382): Gdn_Controller->fetchView('', false, false)
#9 /var/www/forums-dual-sphysics-org/library/core/class.pluggable.php(217): Gdn_Controller->xRender()
#10 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(310): Gdn_Pluggable->__call('render', Array)
#11 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(402): DiscussionController->index(2494, 'x', 'p1')
#12 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('5689')
#13 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(279): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array)
#14 /var/www/forums-dual-sphysics-org/index.php(29): Gdn_Dispatcher->dispatch()
#15 {main}
Notice 
rich is deprecated. Use FormatService::renderHtml($content, Formats\RichFormat::FORMAT_KEY) instead.

#0 [internal function]: gdn_ErrorHandler(16384, 'rich is depreca...', '/var/www/forums...', 950, Array)
#1 /var/www/forums-dual-sphysics-org/library/core/functions.general.php(950): trigger_error('rich is depreca...', 16384)
#2 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1729): deprecated('rich', 'FormatService::...')
#3 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1479): Gdn_Format::rich('[{"insert":"I r...')
#4 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(24): Gdn_Format::to('[{"insert":"I r...', 'Rich')
#5 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(170): formatBody(Object(stdClass))
#6 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/comments.php(19): writeComment(Object(stdClass), Object(DiscussionController), Object(Gdn_Session), 1)
#7 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/index.php(53): include('/var/www/forums...')
#8 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(778): include('/var/www/forums...')
#9 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(1382): Gdn_Controller->fetchView('', false, false)
#10 /var/www/forums-dual-sphysics-org/library/core/class.pluggable.php(217): Gdn_Controller->xRender()
#11 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(310): Gdn_Pluggable->__call('render', Array)
#12 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(402): DiscussionController->index(2494, 'x', 'p1')
#13 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('5689')
#14 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(279): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array)
#15 /var/www/forums-dual-sphysics-org/index.php(29): Gdn_Dispatcher->dispatch()
#16 {main}
Notice 
rich is deprecated. Use FormatService::renderHtml($content, Formats\RichFormat::FORMAT_KEY) instead.

#0 [internal function]: gdn_ErrorHandler(16384, 'rich is depreca...', '/var/www/forums...', 950, Array)
#1 /var/www/forums-dual-sphysics-org/library/core/functions.general.php(950): trigger_error('rich is depreca...', 16384)
#2 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1729): deprecated('rich', 'FormatService::...')
#3 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1479): Gdn_Format::rich('[{"insert":"Awe...')
#4 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(24): Gdn_Format::to('[{"insert":"Awe...', 'Rich')
#5 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(170): formatBody(Object(stdClass))
#6 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/comments.php(19): writeComment(Object(stdClass), Object(DiscussionController), Object(Gdn_Session), 2)
#7 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/index.php(53): include('/var/www/forums...')
#8 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(778): include('/var/www/forums...')
#9 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(1382): Gdn_Controller->fetchView('', false, false)
#10 /var/www/forums-dual-sphysics-org/library/core/class.pluggable.php(217): Gdn_Controller->xRender()
#11 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(310): Gdn_Pluggable->__call('render', Array)
#12 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(402): DiscussionController->index(2494, 'x', 'p1')
#13 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('5689')
#14 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(279): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array)
#15 /var/www/forums-dual-sphysics-org/index.php(29): Gdn_Dispatcher->dispatch()
#16 {main}
Notice 
rich is deprecated. Use FormatService::renderHtml($content, Formats\RichFormat::FORMAT_KEY) instead.

#0 [internal function]: gdn_ErrorHandler(16384, 'rich is depreca...', '/var/www/forums...', 950, Array)
#1 /var/www/forums-dual-sphysics-org/library/core/functions.general.php(950): trigger_error('rich is depreca...', 16384)
#2 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1729): deprecated('rich', 'FormatService::...')
#3 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1479): Gdn_Format::rich('[{"insert":"Tha...')
#4 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(24): Gdn_Format::to('[{"insert":"Tha...', 'Rich')
#5 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(170): formatBody(Object(stdClass))
#6 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/comments.php(19): writeComment(Object(stdClass), Object(DiscussionController), Object(Gdn_Session), 3)
#7 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/index.php(53): include('/var/www/forums...')
#8 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(778): include('/var/www/forums...')
#9 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(1382): Gdn_Controller->fetchView('', false, false)
#10 /var/www/forums-dual-sphysics-org/library/core/class.pluggable.php(217): Gdn_Controller->xRender()
#11 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(310): Gdn_Pluggable->__call('render', Array)
#12 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(402): DiscussionController->index(2494, 'x', 'p1')
#13 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('5689')
#14 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(279): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array)
#15 /var/www/forums-dual-sphysics-org/index.php(29): Gdn_Dispatcher->dispatch()
#16 {main}
Notice 
rich is deprecated. Use FormatService::renderHtml($content, Formats\RichFormat::FORMAT_KEY) instead.

#0 [internal function]: gdn_ErrorHandler(16384, 'rich is depreca...', '/var/www/forums...', 950, Array)
#1 /var/www/forums-dual-sphysics-org/library/core/functions.general.php(950): trigger_error('rich is depreca...', 16384)
#2 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1729): deprecated('rich', 'FormatService::...')
#3 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1479): Gdn_Format::rich('[{"insert":"Let...')
#4 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(24): Gdn_Format::to('[{"insert":"Let...', 'Rich')
#5 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(170): formatBody(Object(stdClass))
#6 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/comments.php(19): writeComment(Object(stdClass), Object(DiscussionController), Object(Gdn_Session), 4)
#7 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/index.php(53): include('/var/www/forums...')
#8 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(778): include('/var/www/forums...')
#9 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(1382): Gdn_Controller->fetchView('', false, false)
#10 /var/www/forums-dual-sphysics-org/library/core/class.pluggable.php(217): Gdn_Controller->xRender()
#11 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(310): Gdn_Pluggable->__call('render', Array)
#12 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(402): DiscussionController->index(2494, 'x', 'p1')
#13 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('5689')
#14 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(279): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array)
#15 /var/www/forums-dual-sphysics-org/index.php(29): Gdn_Dispatcher->dispatch()
#16 {main}
Notice 
rich is deprecated. Use FormatService::renderHtml($content, Formats\RichFormat::FORMAT_KEY) instead.

#0 [internal function]: gdn_ErrorHandler(16384, 'rich is depreca...', '/var/www/forums...', 950, Array)
#1 /var/www/forums-dual-sphysics-org/library/core/functions.general.php(950): trigger_error('rich is depreca...', 16384)
#2 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1729): deprecated('rich', 'FormatService::...')
#3 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1479): Gdn_Format::rich('[{"insert":"I c...')
#4 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(24): Gdn_Format::to('[{"insert":"I c...', 'Rich')
#5 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(170): formatBody(Object(stdClass))
#6 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/comments.php(19): writeComment(Object(stdClass), Object(DiscussionController), Object(Gdn_Session), 5)
#7 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/index.php(53): include('/var/www/forums...')
#8 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(778): include('/var/www/forums...')
#9 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(1382): Gdn_Controller->fetchView('', false, false)
#10 /var/www/forums-dual-sphysics-org/library/core/class.pluggable.php(217): Gdn_Controller->xRender()
#11 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(310): Gdn_Pluggable->__call('render', Array)
#12 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(402): DiscussionController->index(2494, 'x', 'p1')
#13 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('5689')
#14 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(279): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array)
#15 /var/www/forums-dual-sphysics-org/index.php(29): Gdn_Dispatcher->dispatch()
#16 {main}
Notice 
rich is deprecated. Use FormatService::renderHtml($content, Formats\RichFormat::FORMAT_KEY) instead.

#0 [internal function]: gdn_ErrorHandler(16384, 'rich is depreca...', '/var/www/forums...', 950, Array)
#1 /var/www/forums-dual-sphysics-org/library/core/functions.general.php(950): trigger_error('rich is depreca...', 16384)
#2 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1729): deprecated('rich', 'FormatService::...')
#3 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1479): Gdn_Format::rich('[{"insert":"In ...')
#4 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(24): Gdn_Format::to('[{"insert":"In ...', 'Rich')
#5 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(170): formatBody(Object(stdClass))
#6 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/comments.php(19): writeComment(Object(stdClass), Object(DiscussionController), Object(Gdn_Session), 6)
#7 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/index.php(53): include('/var/www/forums...')
#8 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(778): include('/var/www/forums...')
#9 /var/www/forums-dual-sphysics-org/library/core/class.controller.php(1382): Gdn_Controller->fetchView('', false, false)
#10 /var/www/forums-dual-sphysics-org/library/core/class.pluggable.php(217): Gdn_Controller->xRender()
#11 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(310): Gdn_Pluggable->__call('render', Array)
#12 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(402): DiscussionController->index(2494, 'x', 'p1')
#13 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('5689')
#14 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(279): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array)
#15 /var/www/forums-dual-sphysics-org/index.php(29): Gdn_Dispatcher->dispatch()
#16 {main}

© Vanilla Keystone Theme 2025