Computational Fluid Dynamics for Engineering | My Assignment Tutor

School of Engineering and the Environment. Coursework Assessment Brief. Page 1 of 6 School of Engineering and the EnvironmentDepartment of Mechanical EngineeringCoursework Assessment BriefModule CodeME7724Module TitleComputational Fluid Dynamics for EngineeringApplicationsTitle of AssessmentCFD analysis of a commercial vehicleSummative (% of module) orFormativeSummative – this assignment is worth 60% ofyour module gradeTypical individual student hoursrequired to complete theassessment60 hours per studentAssessment set by (andcontact)Dr Konstantin [email protected] deadline (date andtime)18th January 2021 23h59Formal feedback16th February 2021 09h00All assignments must be submitted by the date and time specified above.Students are required to submit an electronic copy of their completed assignmentvia the Assignments section of Canvas and follow any specific instructions. Anychange to this instruction will be advised via Canvas.In line with Faculty policy for late submission of coursework, any work submitted upto a week late will be capped at 40%. Coursework submitted after this time willreceive 0%.In case of illness or other issues affecting your studies please refer to the UniversityMitigating Circumstances policy. Guidance on mitigating circumstances can befound on MyKingston: on avoiding academic assessment offences such as plagiarism andcollusion can be found on MyKingstonhttps://mykingston/myuni/academicregulations/Pages/default.aspxModule Learning Outcomes School of Engineering and the Environment. Coursework Assessment Brief. Page 2 of 6 The following module learning outcomes and professional body learning outcomesare tested in this assessment:(LO2) Construct appropriate solid models for CFD analysis, setup the solutiondomain and generate suitable surface and volume grids via meshing tool. (SM3m,SM5m)(LO3) Understand both flow physics and mathematical properties of governingNavier-Stokes equations and define appropriate boundary conditions. (EA3m)(LO4) Use CFD software to model flow problems of relevance to MechanicalEngineers. Analyse the CFD results and compare them with available data. (SM4m,EA1m, EA4m, EA5m, EA6m, D3m, EP4m)Assessment task and specific termsSubmission details and requirements:(1) Pleaseopen the solid models in Solidworks and save them in Parasolid formatbefore using in Ansys (as done in some tutorials). Modifications of the original solidmodel should be done in Ansys using Design Modeller, otherwise modificationscould be not compatible with Ansys. Calculations should be performed with fullythree-dimensional model. To simplify meshing, you are allowed to introduce a smallgap between the wheels and the ground. Kingston University cluster can be used asan option to speed up CFD calculations.(2) You need to submit an electronic copy of the report in PDF format toCanvas/ME7724 for similarity and plagiarism checks. Please avoid MS Word filesubmission on Canvas because of some formatting issues with equations. Your workshould be first fully word-processed (not handwritten and scanned) and then a copysaved as PDF for Canvas submission. Hardcopy not required. Do not includeANSYS WB files to the Canvas Submission.(3) You need to upload an archived copy of your ANSYS WB files (.wbpz file) forQuestion 2 on Box and include the link in an appendix e.g. appendix A in your report.(4) The maximum word limit for the report is 3000 words. Figures limits are specifiedin the relevant assignment sections. No other specific format is imposed.(5) You should refer to the bibliographic sources you use in your assignment. A list ofReferences must be presented at the end of the report listing all bibliographicsources cited, in Harvard style.CFD ANALYSIS OF A COMMERCIAL VEHICLE School of Engineering and the Environment. Coursework Assessment Brief. Page 3 of 6 INTRODUCTIONIn this assignment you will use ANSYS Workbench and ANSYS CFX to investigatethe aerodynamics of a commercial vehicle. The study is to be carried out on anaccurate dimensional model of a standard 7.5 ton box van:In PART1 of the assignment you are asked to carry out an analysis of the box van atthe speed of 60mph in air at 20 oC.In PART2, you are asked to modify the box van to add features which you believewill improve the aerodynamics and to repeat the analysis of PART1 for your modifiedvehicle to quantify the improvements you have achieved.In PART3, you are asked to report on your work, to quantify and discuss yourfindings and to provide a critical appraisal of your modelling methodology.A SolidWorks solid model file boxvan.SLDASM for the box van together with itsassociated 3 files can be foundon Box.All files in the folder should be copied to your own file space before beginning anywork.PART 1: INITIAL ANALYSIS (35%)Using the standard methodology described in the ME7724 Tutorials sessions onexternal flow analysis as a guide, import the supplied model into ANSYS Workbench,set up the CFD model, solve it using ANSYS CFX and examine the characteristics ofthe flow. For the initial analysis, the model should be set up identically to the modelinvestigated during the tutorial sessions except that the choice of the flow domaindimensions and inflation layers are for you to decide. In carrying out the modellingyou should: School of Engineering and the Environment. Coursework Assessment Brief. Page 4 of 6  Check the solid model and save it in a new format (if required). Create the flow domain geometry and isolate the fluid region. Identify and label the flow domain boundaries. Set up the controlling parameters for surface and volume meshing. Model the boundary layer using layer inflation. Generate Preview Groups showing the mesh on key surfaces. Generating the volume mesh. Set up the physics of the flow and assign appropriate boundary conditions. Set up the initial flow conditions and the solution monitors and controls. Solve the model and monitor the solution convergence. Create Contour, Streamline and Isosurface plots. Assess the quality of the boundary layer modelling from the y+ distribution. Use the CFX Function Calculator to determine lift and drag forces andcoefficients.(10 marks)Investigate the effect of domain size on your numerical results for lift and drag byvarying the domain dimensions in a systematic way.(10 marks)On completion of the analysis you should summarise your findings, and illustrate thegeneral flow field around the bodyshell highlighting any problem areas or interestingflow features using combinations of appropriate Contour, Streamline and Isosurfaceplots. These plots should be produced IN COLOUR. No more than ten imagesshould be provided and each one should be annotated and discussed to indicate thefeatures you found to be of interest. Provide a clear statement of the results of yourinvestigations into the effect of flow domain size and select suitable flow domaindimensions for PART2.(15 marks)PART 2: AERODYNAMIC MODIFICATIONS (30%)Carry out some literature research into ways of improving the aerodynamics ofcommercial vehicles. Based on your research, choose two features you believe willimprove the aerodynamic performance of the box van and describe why you believethat they will be effective.(10 marks)Modify the given solid model to incorporate the features you have selected and re-dothe CFD simulations and analysis of PART1 for your modified model. In carrying outthis additional analysis, there is no need to conduct further investigations into theeffect of flow domain size. However, so that you can make direct comparisonsbetween the results of PARTS1 & 2 and quantify the benefits achieved by yourmodifications, you should ensure that you use flow domain dimensions which youalready used in PART1. Report the percentage reduction in the drag force achievedusing your modified model. There is no specific target for the drag force but youneed will to discuss any reduction or increase in the drag force on your modifiedmodel.As before, illustrate the flow field around the modified model usingcombinations of appropriate Contour, Streamline and Isosurface plots. All plotsshould be produced IN COLOUR. No more than ten images should be provided and School of Engineering and the Environment. Coursework Assessment Brief. Page 5 of 6 again, each one should be annotated to indicate the features you found to be ofinterest and to highlight any flow improvements you observe.(20 marks)PART 3: REPORT AND DISCUSSION (35%)Provide a 3000-word report describing the results of your work.The report should include all the plots you obtained in carrying out the work forPARTS 1 & 2, together with a clear table summarizingand comparing the numericalresults for the drag and lift forces. The report should provide brief details of yourmodelling methodology together with a clear statement of all the flow domaindimensions and inflation layer you used. It should also describe the aerodynamicdesign elements you have incorporated in your improved box van model togetherwith their engineering basis. By referring to the plots you obtained, link theaerodynamic design elements you incorporated to the flow features evident in theplots.Provide a critical appraisal of the CFD modelling methodology you used for theassignment and discuss how it could be improved upon. Your discussion shouldinclude comments on the appropriateness of the turbulence model used and on thequality of the boundary layer modelling achieved.Note: In assessing your work, credit will be given for well thought out practicalsolutions showing technical engineering insight and understanding and for clarity ofthought in both interpreting and presenting your results. Your report should beentirely in your own words. There should be no need for you to download largetracts of material from websites. No credit will be given for such material.END OF ASSIGNMENTAssessment CriteriaAssessment of your submission will be based on the following weighted assessmentcriteria as given below which relate to the specified module and PSRB learningoutcomes. Assessment criteria are reproduced in Canvas in a rubric.Specific Criteria (marking scheme).Marks availablePART 1: INITIAL ANALYSIS35%Flow analysis and CFD model10%Domain analysis10%Mesh quality analysis15%PART 2: AERODYNAMIC MODIFICATIONS30%Literature research10%Flow analysis and modified model20%PART 3: REPORT AND DISCUSSION (35%)35%Content20%Presentation15%Total = 100%Academic skills support School of Engineering and the Environment. Coursework Assessment Brief. Page 6 of 6 For help and advice on this assessment please contact the assessment setter/s orthe module leader. For advice on academic writing and referencing please contactthe Faculty of Science, Engineering and Computing (SEC) Academic SuccessCentre (SASC). Trained staff and students will give you guidance and feedback onassessments. SASC can be contacted by email: [email protected] and is openevery day in PRSB1019 and on Wednesdays at RV Library.


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