Dynamic Analysis Of Water Bottle Based On Fluid-structure Interaction

Water bottle is an important component of engine forced circulation water coolingsystem,which directly affects the reliability of the cooling system or even the engine. Itwill be subject to the gravity, shock of coolant and mechanical loads when working. It’spossible that the adhesive surface of the shellwill be cracked or install support plate willbe fracture when the water bottle works in harsh conditions. But there are few people todo its fluid-structure interaction simulation abroad. So it is necessary to do a dynamicsanalysis through simulation system, then to get its dynamic parameters, to check itsstructural strength, and through analysis to understand the impact of the liquid level andthe temperature on the dynamic properties of the water bottle. Fluid-structureinteraction of water bottle based on dynamic analysis also has certain reference value tothe design of small plastic reservoir analysis equipment.In this paper, a corresponding finite element analysis models establishedbased onthree-dimensional geometrical model, and the simulation of fluid-structure interactionanalysis is made on the platformof ADINA, including static fluid-structure interactionanalysis, displacement excitation and response analysis and solid coupling modalanalysis based on potentialfluid flow. The main contents and conclusions are as follows:①Through fluid-solid coupling modal analysisof water bottle at room temperature,it is found that water bottle system modal is divided into low-level fluid sloshingmodaland higher-order structurevibration modal. The fluid effect on the structure modalfrequency is very obvious, but almost no effect on the structural modal. So, thefluid-structure interaction mode shapes modalcan be quickly and accurately determinedby pure structuremodal analysis.②In this paper, the processing of cooling liquid sloshing has been correctlysimulated by using VOF method. The results show that the liquid level and thedisplacement excitation intensity have a big impacton the structural stress size anddeformation of water bottle. However, at the room temperature, the water bottle underdisplacement excitation of different intensity housing does not exceed the maximumstress6MPa,less than the strength of the material at current case33MPa, The maximumstress of The maximum stress paste face not exceed2MPa,the less than the adhesivestrength. Therefore, Water bottle’s structural strength meet the allowable requirements atambient temperatures. ③Through the water bottle systems analysis at different temperatures based onfluid-structure interaction, we found temperature has influence to Modal frequenciesrather than structure modal shape of water bottle by Modal analysis of fluid-structureinteraction of water bottle system at different temperatures. Temperature elevate, Modalfrequencies depress. At80degree, the actual maximum level of Modal frequenciesreduce to44.46Hz. At this time, water bottle may aroused resonance, causing aStructural deformation and increase, stress increase, even the danger of fracture④Temperature has no effect on stress distribution of water bottle structure, andlittle impact on magnitude of Equivalent stress. Temperature elevate, stress will haveSmall increase. When at80°, the actual maximum level of water bottle system begin toresponse aroused by the Vertical displacement at44.5Hz, Deformation of the structureand the peak of structural stress suddenly increased. Especially when the displacementup to10g, the peak of housing stress reach to20MPa. At this time, water bottle housingwill occur yield risk.