×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Design and Simulation of a four stroke Otto engine

Design and Simulation of a four stroke Otto engine

Design and Simulation of a four stroke Otto engine

(OP)
Hello,

I am looking for resources that show you how to design an simulate and engine from scratch.

I want to design a complete engine using CAD. Afterwards I would like to analyze the engine using FEA and CFD simulations.
This is all for learning purposes. I will be using NX12 and probably ANSYS for CFD, although the package shouldn't matter to much.
Is there basically a tutorial on this whole process?

Thanks

RE: Design and Simulation of a four stroke Otto engine

What specifically are you trying to learn and how much are you willing to spend? Do you want to build a running engine or, even more challenging, an efficient engine? I ask because I have spent the last five years learning the new engine design process without using expensive tools (such as Converge: https://convergecfd.com/applications/internal-comb...). It would have gone much faster had I just purchased a Converge license for a couple of grand but, even that tool will only absolve you of the need to learn all the thermodynamics, heat transfer, chemical kinetics, and other topics required to build an efficient engine. A good overview of what's required can be had by reviewing the AME 436 course materials at http://ronney.usc.edu/.

RE: Design and Simulation of a four stroke Otto engine

(OP)
I just want to model an engine from scratch using CAD and then run simulations like FEA and CFD.

The purpose of this is to learn about engines and its fields. And to become sufficient at CAE.

RE: Design and Simulation of a four stroke Otto engine

There are a number of tutorials at GrabCad (https://grabcad.com/tutorials?tag=engine&time=...) and Solidworks has done one as well (https://www.youtube.com/channel/UCtwaWPOXEBysZLh1r...).

FEA will require you have estimates of combustion pressures and you'll need to do some basic calculations to derive them. You could get the necessary pressure curves by making a very simple model of your engine using Professor Ronney's AirCycles4Recips.xls spreadsheet available at http://ronney.usc.edu/spreadsheets/AirCycles4Recip....

CFD is a very broad field. It's pretty straightforward to analyze intake flow. Exhaust flow requires understanding of pressures and temperatures produced by combustion which you could pull from Professor Ronney's spreadsheet. CFD analysis of cooling requires an understanding of cylinder wall temperatures which the professor's spreadsheet skips over using a constant, but it's informed by his experience, so you could likely calculate a reasonable estimate of heat flux on the cylinder walls from his spreadsheet.

Just getting all the parts designed and assembled into a dynamic (animated) assembly will be a pretty good accomplishment to start with. I recommend you start with a single cylinder then work up as you gain experience.

RE: Design and Simulation of a four stroke Otto engine

(OP)
Nice find!

Well I'll start with the CAD process and finish that off first.

Will most likely return to ask about the simulation part.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources

White Paper: Industrial Control Basics: Contactors
A contactor is an electrical device used for switching an electrical circuit on or off. Considered to be a special type of relay, contactors are used in applications with higher current carrying capacity, while relays are used for lower current applications. Download Now
Research Report: State of IoT Adoption in Product Development 2019
This research report, based on a survey of 234 product development professionals, examines the current state of Internet of Things (IoT) adoption by product design teams, its perceived importance, and what features and capabilities teams consider important when making decision about adding IoT functionality to their products. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close