| Subject name (in Hungarian, in English) | Vehicle Aerodynamics | |||
|
Vehicle Aerodynamics
|
||||
| Neptun code | BMEGEATBSGVEHA-01 | |||
| Type | study unit with contact hours | |||
| Course types and number of hours (weekly / semester) | course type: | lecture (theory) | exercise | laboratory excercise |
| number of hours (weekly): | 2 | 0 | 1 | |
| nature (connected / stand-alone): | - | - | coupled | |
| Type of assessments (quality evaluation) | mid-term grade | |||
| ECTS | 4 | |||
| Subject coordinator | name: | Dr. Suda Jenő Miklós | ||
| post: | adjunct | |||
| contact: | suda.jeno.miklos@gpk.bme.hu | |||
| Host organization | Department of Fluid Mechanics | |||
| http://www.ara.bme.hu | ||||
| Course homepage | http://www.ara.bme.hu/oktatas/tantargy/NEPTUN/BMEGEATBSGVEHA-01 | |||
| Course language | hungarian, english | |||
| Primary curriculum type | mandatory elective | |||
| Direct prerequisites | Strong prerequisite | BMEGEÁTBG11 | ||
| Weak prerequisite | ||||
| Parallel prerequisite | ||||
| Milestone prerequisite | at least obtained 0 ECTS | |||
| Excluding condition | none | |||
Aim
The course introduces students to the field of vehicle aerodynamics. The student gains insight into the aerodynamics of streamlined and bluff bodies. After a summary of basic aerodynamic knowledge and a historical summary of vehicle aerodynamics developments, the aerodynamics of passenger cars, and to a lesser extent racing cars, buses and trucks, and the CFD methods of solving aerodynamic problems are described in detail. Students acquire knowledge related to vehicle aerodynamics wind tunnel measurement techniques. In the second half of the semester, student groups perform a lab project task to measure the aerodynamic parameters of a 1:20 car model of their own design and construction in a wind tunnel and to visualise the flow field around the car model. In addition to acquiring theoretical knowledge, they gain insight into the practical examination of aerodynamic parameter changes during the evaluation and analysis of the results of the lab measurement.
Learning outcomes
Competences that can be acquired by completing the course
Knowledge
The student is familiar with the concepts of the field of vehicle aerodynamics The student knows the historical steps of vehicle aerodynamic developments. The student understands the characteristics of the flow field around blunt and streamlined bodies and the factors influencing aerodynamic characteristics. The student knows the theoretical foundations of the generation of aerodynamic force. The student knows the derivation and calculation method of aerodynamic force, moment and their coefficients. The student are aware of the concepts of form drag and viscous drag. The student has comprehensive knowledge of the possibilities of changing the aerodynamic parameters of road vehicles. The student is informed about the consequences of modifying aerodynamic elements of road vehicles. The student identifies the measurement methods, factors, and parameters of wind tunnel measurement technology that are important from a vehicle aerodynamics perspective. The student identifies the main types, structure and operating principle of wind tunnels. The student provides information on the theoretical background of the corrections applied during wind tunnel measurements, their calculation method, and the method of converting them to real aerodynamic parameters. The student names the factors and parameters of vehicle aerodynamics numerical simulation (CFD) that are important from a vehicle aerodynamics perspective, and the key issues that are important from a CFD modelling perspective. The student defines the relationship between vehicle aerodynamic parameters and the vehicle-specific aerodynamic power loss, and its calculation method. The student is informed about current development directions, key issues and modern practical solution options in vehicle aerodynamics.
Ability
The student is able to comprehensively evaluate vehicle aerodyanmics development solutions. The student uses concepts from the field of vehicle aerodynamics. The student analyses the major steps in the history of road vehicle aerodynamics. The student interprets the characteristics of the flow field around blunt and streamlined bodies and the factors influencing aerodynamic characteristics. The student is capable of deriving and calculating aerodynamic forces, moments and factors. The student identifies the possibilities for changing the aerodynamic parameters of passenger cars, racing cars, buses and trucks, and the theoretical and practical possibilities for modifications. The student applies the measurement and evaluation methods of wind tunnel measurement technology that are important from a vehicle aerodynamics perspective. The student defines the correction factors used during wind tunnel model measurements and the conversion to the aerodynamic parameters of the real vehicle. The student is capable of determining the factors and parameters of vehicle aerodynamics numerical simulation (CFD) that are important from a vehicle aerodynamics perspective, as well as key issues that are important from a modelling perspective. The student calculates the aerodynamic power loss characteristic of the vehicle based on the vehicle aerodynamic parameters. The student outlines current engineering solutions, key issues, and modern practical solutions in vehicle aerodynamics. The student draws conclusions about the quality of vehicle aerodynamics solutions from wind tunnel measurement data. The student analyses the measurement results of aerodynamic parameters (force factors). The student identifies the relationships between vehicle flow parameters and the aerodynamic behavior of vehicles.
Attitude
The student can initiate collaboration with the instructor and fellow students to expand knowledge. The student expands his knowledge with the continuous acquisition of knowledge and a wide-ranging attitude. The student is open to the in-depth use of modern information technology tools. The student seeks to become familiar with and routinely use the system of tools needed to solve fluid flow problems. The student strives for an independent, accurate, error-free, and responsible solution. The student strives to apply the principles of reliable operation, productivity, cost and time efficiency, energy efficiency, and environmental awareness in solving flow engineering tasks. The student develops its ability to align ethical engineering attitudes and long-term win-win considerations with market competition.
Independence and responsibility
The student independently thinks through fluid tasks and problems and solves them based on specific resources. The student accepts well-founded critical remarks and criticisms. In some situations, as part of a team, students work with their fellow students to solve tasks. The students support a systematic approach and complex thinking in their thinking. The student is critical of engineering commitments of inadequate quality.
Teaching methodology
Lectures, laboratory measurements, written and oral communication, use of IT tools and techniques, optional laboratory measurement tasks prepared independently and in groups, work organization techniques.
Support materials
Textbook
Tamás Lajos: Fundamentals of Fluid Mechanics. 2015, ISBN 978 963 12 2885 4.
Schuetz T. (ed.): Aerodynamics of Road Vehicles, 5th ed., 2015, SAE Int, ISBN 978-0-7680-7977-7
Barnard, RH: Road Vehicle Aerodynamic Design - An Introduction (MechAero Publishing, 2009, ISBN 9 780954 073473)
Lecture notes
Suda JM: Vehicle Aerodynamics (Road Vehicles - Part 1 Lecture Note), 2021
Online material
http://www.ara.bme.hu/oktatas/tantargy/NEPTUN/BMEGEATBSVEHA-01
https://youtube.com/playlist?list=PLZMS6jtbk5ZRW731GEpejw4Pwmj23Hzuk
Validity of the course description
| Start of validity: | 2025. September 1. |
| End of validity: | 2030. July 15. |
General rules
A 2.2. The assessment of the learning outcomes set out in point 1 is based on two mid-term written tests and a measurement lab report and presentation. One of the conditions for obtaining a mid-term mark: participation in the lectures is obligatory (min. 70%), which is checked according to the regulations of the Code of Studies. Attendance is checked at each lecture with an attendance sheet signed by the student present. Another condition for obtaining a mid-term mark is that the student has a min.40% rated midterms and accepted measurement report and min.40% rated accepted presentations.
Assessment methods
Detailed description of mid-term assessments
| Mid-term assessment No. 1 | ||
| Type: | summative assessment | |
| Number: | 2 | |
| Purpose, description: | Mid-terms (ZH-1, ZH-2): The acquisition of the curriculum is checked with two 90-minute written tests (max. 25 + 25 points) held at the middle of the semester and at the end during the lecture time. The result of this midterm counts for 50% of the term-end grade. The mindterms contain 4-5 theoretical and calculation excercise tasks each. The answers to the two midterms are evaluated at min. 30% separately, and a total of min. 40% is required. | |
| Mid-term assessment No. 2 | ||
| Type: | formative assessment, point-in-time personal act | |
| Number: | 1 | |
| Purpose, description: | Measurement report (MJK): In the lab course held in the second half of the semester, student groups of 3-5 build a 1:20 scale model car, and determine the aerodynamic force coefficients of the car through independent wind tunnel measurements, as well as flow visualisation tests, which are documented with photos and videos. The results of the measurements are to be summarised in a measurement report marked with MJK (max. 40p) and a measurement presentation marked with MP (max. 10p). A minimum of 40% is the minimum requirement for acceptance of the MJK and MP separately. The weight of the points obtained from the measurements in the term-end grade is 50%. | |
| Mid-term assessment No. 3 | ||
| Type: | formative assessment, point-in-time personal act | |
| Number: | 1 | |
| Purpose, description: | Measurement report (MJK): In the lab course held in the second half of the semester, student groups of 3-5 build a 1:20 scale model car, and determine the aerodynamic force coefficients of the car through independent wind tunnel measurements, as well as flow visualisation tests, which are documented with photos and videos. The results of the measurements are to be summarised in a measurement report marked with MJK (max. 40p) and a measurement presentation marked with MP (max. 10p). A minimum of 40% is the minimum requirement for acceptance of the MJK and MP separately. The weight of the points obtained from the measurements in the term-end grade is 50%. | |
Detailed description of assessments performed during the examination period
The subject does not include assessment during the examination period.
The weight of mid-term assessments in signing or in final grading
| ID | Proportion |
|---|---|
| Mid-term assessment No. 1 | 50 % |
| Mid-term assessment No. 2 | 40 % |
| Mid-term assessment No. 3 | 10 % |
The weight of partial exams in grade
There is no exam belongs to the subject.
Determination of the grade
| Grade | ECTS | The grade expressed in percents |
|---|---|---|
| very good (5) | Excellent [A] | above 90 % |
| very good (5) | Very Good [B] | 85 % - 90 % |
| good (4) | Good [C] | 70 % - 85 % |
| satisfactory (3) | Satisfactory [D] | 55 % - 70 % |
| sufficient (2) | Pass [E] | 40 % - 55 % |
| insufficient (1) | Fail [F] | below 40 % |
The lower limit specified for each grade already belongs to that grade.
Attendance and participation requirements
Must be present at at least 70% (rounded down) of lectures.
At least 70% of laboratory practices (rounded down) must be actively attended.
Special rules for improving, retaken and replacement
The special rules for improving, retaken and replacement shall be interpreted and applied in conjunction with the general rules of the CoS (TVSZ).
| Need mid-term assessment to invidually complete? | ||
| yes | ||
| The way of retaking or improving a summary assessment for the first time: | ||
| each summative assessment can be retaken or improved | ||
| Is the retaking-improving of a summary assessment allowed, and if so, than which form: | ||
| retake or grade-improving exam possible for each assesment separately | ||
| Taking into account the previous result in case of improvement, retaken-improvement: | ||
| new result overrides previous result | ||
| The way of retaking or improving a partial assessment for the first time: | ||
| partial assesment(s) in this group can be improved or repeated once up to the end of the repeat period | ||
| Completion of unfinished laboratory exercises: | ||
| missed laboratory practices must be performed in the teaching term at pre-arranged appointment | ||
| Repetition of laboratory exercises that performed incorrectly (eg.: mistake in documentation) | ||
| incorrectly performed laboratory practice (e.g. Incomplete/incorrect report) can be corrected upon improved re-submission | ||
Study work required to complete the course
| Activity | hours / semester |
|---|---|
| participation in contact classes | 42 |
| preparation for laboratory practices | 14 |
| preparation for summary assessments | 32 |
| additional time required to complete the subject | 32 |
| altogether | 120 |
Validity of subject requirements
| Start of validity: | 2025. September 1. |
| End of validity: | 2030. July 15. |
Primary course
The primary (main) course of the subject in which it is advertised and to which the competencies are related:
Mechanical engineering
Link to the purpose and (special) compensations of the Regulation KKK
This course aims to improve the following competencies defined in the Regulation KKK:
Knowledge
- Student is familiar with the general and specific mathematical, scientific and social principles, rules, contexts and procedures needed to operate in the field of engineering.
- Student has the knowledge of the theories and contexts of fundamental importance in the field of engineering and of the terminology which underpins them.
- Student has the knowledge of metrology and measurement theory in the field of mechanical engineering.
Ability
- Student has the ability to apply the general and specific mathematical, scientific and social principles, rules, relationships and procedures acquired in solving problems in the field of engineering.
- Student has the ability to apply the theories and related terminology in an innovative way when solving problems in a given field of engineering.
- Student has the ability to apply an integrated knowledge of machinery, mechanical equipment, systems and processes, materials and technologies for mechanical engineering, and related electronics and information technology.
Attitude
- Student is open and receptive to learning, embracing and authentically communicating professional, technological development and innovation in engineering.
- Student strives to plan and carry out tasks to a high professional standard, either independently or in a team.
- Student strives to acquire a broad and comprehensive literacy.
Independence and responsibility
- Student has the ability to work independently on engineering tasks.
- Student takes responsibility for the sub-processes under student's management.
- Student acts independently and proactively in solving professional problems.
Prerequisites for completing the course
|
Knowledge type competencies
(a set of prior knowledge, the existence of which is not obligatory, but greatly facilitates the successful completion of the subject) |
none |
|
Ability type competencies
(a set of prior abilities and skills, the existence of which is not obligatory, but greatly contributes to the successful completion of the subject) |
none |