مدلسازی عددی فشار وارد بر موج شکن سکویی مرکب و مقایسه آن با موج شکن کیسونی افقی با درنظرگیری اثر محیط متخلخل

توزیع فشار حاصل از اندرکنش موج و سازه بر موج شکن های کیسونی افقی، یکی از پارامترهای تاثیرگذار بر طراحی این موج شکن می باشد. با توجه به تاثیر قابل توجه این پارامتر، استفاده از موج شکن سکویی مرکب جهت بهبود عملکرد و کاهش نیروهای وارد بر سازه مورد بررسی قرار گرفته است. در این مطالعه به مدلسازی عددی فشار وارد بر موج شکن سکویی مرکب و مقایسه آن با موج شکن کیسونی افقی به وسیله مدل عددی flow-3d پرداخته شده است. موج شکن سکویی مرکب نسبت به موج شکن کیسونی افقی در p1 (حداکثر فشار وارد بر کیسون در تراز آب) مقدار فشار بدست آمده کاهش 52/09 %، در p2 (حداکثر فشار در تاج کیسون) مقدار فشار بدست آمده کاهش 63/07 و در p3 (حداکثر فشار در پنجه کیسون) کاهش 76/09% و در pu ( فشار بالابرنده زیر کیسون) این مقدار فشار کاهش 53/92% را داشته است.

numerical modeling of pressure on composite berm breakwater and its comparison with horizontally caisson breakwater considering the effect of porous medium

coastal areas of each country are among the most valuable national resources. proximity to seas and oceans not only provides unparalleled privileges for easy and inexpensive transportation, but also provides grounds for economical, commercial and military activities. breakwaters have changed a lot during their design history. in check the pressure on caisson of composite berm breakwater is important according to its impact on the design of this breakwateras well as its effect on hydraulic reactions. when composite berm breakwater is investigated against wave interaction, knowing the created water pressure in berm of breakwater due to wave interaction is important because of its effect on many reaction parameters of the porous structure, including wave run-up and wave overtopping. the pressure distribution resulting from the wave interaction in the horizontally caisson breakwater is one of the important parameters in the design of this breakwater. due to the significant impact of this parameter, the use of composite berm breakwater has been investigated to improve the performance and reduce the forces applied to the structure .in this study, numerical modeling of pressure on composite berm breakwater and its comparison with horizontally caisson breakwater has been investigated by numerical model of flow-3d. also, the use of the composite name is due to the presence of caisson in the berm breakwater.the use of caisson in composite berm breakwater, in contrast to berm breakwater, reduces the volume ofconsumable materials. on the other hand, by reducing the pressure on the caisson in the composite bermbreakwater, it will be possible to build a caisson with thinner walls, which reduces the cost of buildingbreakwater. the results of the laboratory model have been used to evaluate the outputs of the numerical model. therefore, by analyzing the sensitivity of the numerical model, the number of suitable mesh is selected and then by calibrating and verifying the numerical model the accuracy of simulation results will be evaluated. to ensure the function of the numerical model, its results was calibrated and verified with existing laboratory data. in general, according to the results presented in the context of the pressure applied to caisson, the composite berm breakwater has a very good performance compare to the horizontally caisson breakwater. the greatest amount of pressure on the crest of composite berm breakwater (p2) is related to composite berm breakwater type2. by examining velocity magnitude at the moment of maximum pressure occurrence in thecaisson crest, it is determined that at this moment the wave is broken and the impact pressure caused by thewave break increased the pressure in the caisson crest. in the second type of the composite berm breakwater,when the wave breakdown on the berm and the breaker plunge happens in the caisson proximity, it willincrease the pressure on the caisson of the composite berm breakwater. in composite berm breakwater,compared with the horizontally caisson breakwater at p1 (the maximum pressure applied to the caisson at thesurface of the water), the amount of achieved pressure showed the reduction of 52.09% and at p2 (maximumpressure in the caisson crest), the achieved pressure showed 63/07 % decrease. also in p3 (maximum pressure in caisson toe), the pressure was reduced by 76.09%, and in pu (uplift pressure under caisson), this value indicates a decrease of 53.92%.