Help regarding WaveLength

Asalih3d · March 2020

Hello guys!

I am running the 08_WavesFlap example in "main", and trying to understand how this property is calculated:

I am struggling to figure out how wave length is calculated and if somebody could show me directly in the code where this calculation is done it would help me a lot. I have found this on the internet:

https://www.scubageek.com/articles/wwwceler.html

But am struggling to calculate it since, it feels like I should know both d and L at the same time, where I only know d (depth) initially..

Kind regards

Asalih3d · March 2020

Trying to understand it better, I am playing around with the values quite a bit. It is a bit hard for me though, since I get a lot of warnings where I am a bit lost

And also Madsen's criteria is a bit problematic for me;

HL^2/d^3 < 8π^2/3

Is it 8 pi^2 / 3 or 8 pi^(2/3)

I have downloaded the source code and trying to search through all files for "Waves breaking .." etc. but I simply cannot figure out where the calculations of these warnings is actually done.

Kind regards

atish_d · June 2020

Hi @Asalih3d ,

Not sure if you have managed to figure this one out yet, but figured I'd help anyway

When calculating the wavelength, I use a generic formula applicable to all relative depths

d/Lo = (d/L)tanh((2pi*d)/L) where Lo is the 'deepwater' wavelength, Lo = gT^2/2*pi

Solving this iteratively using any numerical method will give you the answer calculated by DSPH as the wavelength L is the only unknown

Hope this helps :)

Asalih3d · June 2020

Hello @atish_d !

No I actually never managed to figure it out - thanks for that. Could you share where you was taught this or where to find more information about how to do it? :-)

Kind regards

atish_d · June 2020

Hi @Asalih3d

I learnt it as a coastal engineering student, search for 'dispersion relation', this should give you the info you're looking for :)

Regards

Notice	rich is deprecated. Use FormatService::renderHtml($content, Formats\RichFormat::FORMAT_KEY) instead. #0 [internal function]: gdn_ErrorHandler(16384, 'rich is depreca...', '/var/www/forums...', 950, Array) #1 /var/www/forums-dual-sphysics-org/library/core/functions.general.php(950): trigger_error('rich is depreca...', 16384) #2 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1729): deprecated('rich', 'FormatService::...') #3 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1479): Gdn_Format::rich('[{"insert":"Hel...') #4 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(197): Gdn_Format::to('[{"insert":"Hel...', 'Rich') #5 /var/www/forums-dual-sphysics-org/applications/vanilla/controllers/class.discussioncontroller.php(402): DiscussionController->index(1761, 'x', 'p1') #6 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('3636') #7 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(279): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array) #8 /var/www/forums-dual-sphysics-org/index.php(29): Gdn_Dispatcher->dispatch() #9 {main}
Notice	rich is deprecated. Use FormatService::renderHtml($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":"Hel...') #4 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(24): Gdn_Format::to('[{"insert":"Hel...', '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(1761, 'x', 'p1') #12 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('3636') #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":"Try...') #4 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(24): Gdn_Format::to('[{"insert":"Try...', '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(1761, 'x', 'p1') #13 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('3636') #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":"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/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(1761, 'x', 'p1') #13 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('3636') #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":"Hel...') #4 /var/www/forums-dual-sphysics-org/applications/vanilla/views/discussion/helper_functions.php(24): Gdn_Format::to('[{"insert":"Hel...', '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(1761, 'x', 'p1') #13 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('3636') #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":"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/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(1761, 'x', 'p1') #13 /var/www/forums-dual-sphysics-org/library/core/class.dispatcher.php(862): DiscussionController->comment('3636') #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}

Help regarding WaveLength

Comments

Debug Trace