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JoshTheEngineer
Добавлен 23 май 2013
Hey everyone, I'm Josh! On this channel, you'll find videos about whatever I happen to be interested in at the time, usually (but not always) pertaining to science and engineering. I don't have a regular upload schedule, and I skip around from topic to topic. Hopefully some of my videos can be helpful or interesting!
If you have any questions or comments, feel free to reach out.
Thanks for watching!
If you have any questions or comments, feel free to reach out.
Thanks for watching!
You Should Be Keeping a Research Notebook
A detailed research notebook is an indispensable tool for keeping track of what you've done and when you did it. In this video, I'll walk you through a few simple rules I use for my notebooks, and show examples of how to implement them in yours. If you think keeping notes is a waste of time, then maybe this video isn't for you, and we can't be friends.
00:00 - Introduction
00:20 - Background
00:49 - Notebook types
01:49 - Writing utensils
02:22 - General content structure
02:47 - Page numbering
03:11 - Dates and highlighting
04:33 - Referencing pages and notebooks
05:10 - Adding figures
05:22 - Extra notes, corrections
06:05 - Finishing up
===== NOTES =====
- This is how I do it. There is no right ans...
00:00 - Introduction
00:20 - Background
00:49 - Notebook types
01:49 - Writing utensils
02:22 - General content structure
02:47 - Page numbering
03:11 - Dates and highlighting
04:33 - Referencing pages and notebooks
05:10 - Adding figures
05:22 - Extra notes, corrections
06:05 - Finishing up
===== NOTES =====
- This is how I do it. There is no right ans...
Просмотров: 11 712
Видео
Schlieren Mirrors: Spherical vs. Parabolic
Просмотров 4,5 тыс.3 года назад
Both spherical and parabolic mirrors are used in schlieren systems, but which one should you use and when? In this video, we'll look at how the two mirrors reflect light for two scenarios: 1) How does the mirror reflect the light when the incident rays are collimated (parallel)? 2) How does the mirror reflect the light when the incident rays emanate from the 2f point? We'll see why the spherica...
Creating Schematics in PowerPoint and Inkscape
Просмотров 4,7 тыс.3 года назад
When making schematics for papers you're writing, it's best to create vector-format images so that they don't appear pixelated. In this video, I'll show you two methods of creating and exporting schematics, using 1) PowerPoint and 2) Inkscape. Obviously there are many ways to do this, so if you do it differently, that's fantastic. 00:00 - Motivation 00:36 - PowerPoint: Getting ready 01:01 - Pow...
Introduction to JabRef
Просмотров 34 тыс.3 года назад
JabRef is used as a reference manager, and in this video we'll go through some more of the details for how to use it efficiently. For more information regarding using JabRef for writing papers, see my "Introduction to Latex" video (link below). 00:00 - Introduction 00:31- Dark theme 00:53 - Creating a library 01:14 - When to create new libraries 03:36 - Citation keys 04:57 - Importing citations...
Introduction to LaTeX
Просмотров 9 тыс.3 года назад
Are you interested in creating nice-looking documents, while avoiding the headaches generally associated with normal Word documents? In this video, I'll show you how to get started with LaTeX, including what programs you need (all free), how to put together a simple document and view the resulting PDF, and give you links to some of my templates that you can try out for yourself. 00:00 - Who sho...
ImageJ Start-Up Macro
Просмотров 2,8 тыс.3 года назад
If you write custom macros for ImageJ, and you want them to load upon start-up (instead of navigating to its folder and double-clicking every time), then this video will show you how to accomplish that. The motivation for this video was to show how to add the BOS_Save_Sequence_v2.ijm file to the Plugins → Macros menu for use with my Background Oriented Schlieren code/video (see links below). LI...
BOS ImageJ Macro Update
Просмотров 1,2 тыс.3 года назад
In my DIY Background Oriented Schlieren video, I provided a macro for use in ImageJ that automates the process of extracting sequential images from a video for use in my MATLAB or Python code. That version appears to be outdated now, so this video quickly outlines the updated macro (v2). This updated version is available at the links below. LINKS GitHub (download version 2 of the .ijm macro) ►g...
Multi-Airfoil Source/Vortex Panel Method
Просмотров 4,8 тыс.4 года назад
We've finally reached the last video in my panel method series. Here, I'll show you how to update my single-airfoil SPVP code to be able to solve multi-airfoil systems. After explaining the updates (which takes about 20 minutes), we'll go through some examples of different airfoils and systems. CODE ► My website www.joshtheengineer.com/2020/07/12/multi-airfoil-source-vortex-panel-method/ ► GitH...
Source/Vortex Panel Method: Airfoil
Просмотров 6 тыс.4 года назад
The source/vortex panel method code in this video is a combination of the source and vortex panel methods that I have used in my previous videos. This code solves some of the problems that were mentioned in my "Vortex Panel Method: Airfoil" video. In this penultimate video of my Panel Methods series, we will look at how to populate the matrix system to obtain the solution of the source and vort...
Source/Vortex Panel Method: System of Equations
Просмотров 6 тыс.4 года назад
In this video, we will combine the source panel method and vortex panel method into a hybrid source/vortex panel method that is more robust than our previous vortex panel method implementation, and which follows the method of Hess and Smith. In the next video, we will implement the equations shown here in the MATLAB and Python code. RELEVANT VIDEOS ► Panel Methods Playlist ruclips.net/video/bWj...
Vortex Panel Method: Airfoil
Просмотров 13 тыс.4 года назад
The vortex panel method code in this video is an adaptation of the source panel method code from a few videos ago. The only change we've made between the codes is the formulation of the matrix system of equations (including the addition of the Kutta condition equation). We'll look at a few examples of the code working like you would expect, and compare resulting lift and moment coefficients to ...
Vortex Panel Method: System of Equations
Просмотров 8 тыс.4 года назад
In this video, we will build up the system of equations we need to solve in order to get the vortex panel strengths. First, we get N equations by setting the normal velocity at every control point equal to zero. Next, we get an equation for the Kutta condition. If we simply add this equation into the system of equations, we end up with N 1 equations for N unknowns, which is over-constrained. In...
Streamline Geometric Integral VPM [Nx(pj) and Ny(pj)]
Просмотров 1,8 тыс.4 года назад
In this video, we go through the X and Y velocity expression geometric integrals for the vortex panel method. This is the last geometric integral derivation we will need. RELEVANT VIDEOS ► Panel Methods Playlist ruclips.net/video/bWjo3N9COz4/видео.html NOTES - I'll add notes here if I need to. ERRORS - If you see an error in the video, please let me know and I will include it here. REFERENCES N...
Vortex Panel Method: Tangential Velocity Geometric Integral [L(ij)]
Просмотров 2,6 тыс.4 года назад
We just finished the video for the source panel method (SPM), and saw its inherent limitations as we looked at some results for an airfoil. Now, to be able to code up the vortex panel method (VPM), we need to compute geometric integrals similar to those for the SPM. These geometric integrals come from the expressions for the normal and tangential velocity. In this video, we derive the geometric...
Vortex Panel Method: Normal Velocity Geometric Integral [K(ij)]
Просмотров 5 тыс.4 года назад
We just finished the videos for the source panel method (SPM), and saw its inherent limitations as we looked at some results for an airfoil. Now, to be able to code up the vortex panel method (VPM), we need to compute geometric integrals similar to those for the SPM. These geometric integrals come from the expressions for the normal and tangential velocity. In this video, we derive the geometri...
Source Panel Method: Circular Cylinder
Просмотров 10 тыс.4 года назад
Source Panel Method: Circular Cylinder
Source Panel Method: System of Equations
Просмотров 6 тыс.4 года назад
Source Panel Method: System of Equations
Streamline Geometric Integral SPM [Mx(pj) and My(pj)]
Просмотров 2,5 тыс.4 года назад
Streamline Geometric Integral SPM [Mx(pj) and My(pj)]
Source Panel Method: Tangential Velocity Geometric Integral [J(ij)]
Просмотров 3 тыс.4 года назад
Source Panel Method: Tangential Velocity Geometric Integral [J(ij)]
Source Panel Method: Normal Velocity Geometric Integral [I(ij)]
Просмотров 7 тыс.4 года назад
Source Panel Method: Normal Velocity Geometric Integral [I(ij)]
Flow Around an Airfoil: Panel Methods
Просмотров 11 тыс.4 года назад
Flow Around an Airfoil: Panel Methods
Building More Complex Potential Flows (Panel Methods)
Просмотров 5 тыс.4 года назад
Building More Complex Potential Flows (Panel Methods)
How To Take Pictures Like NASA: DIY Background Oriented Schlieren
Просмотров 24 тыс.4 года назад
How To Take Pictures Like NASA: DIY Background Oriented Schlieren
Uniform + Vortex Flow (Incompressible Potential Flow)
Просмотров 5 тыс.4 года назад
Uniform Vortex Flow (Incompressible Potential Flow)
Vortex Flow (Incompressible Potential Flow)
Просмотров 9 тыс.4 года назад
Vortex Flow (Incompressible Potential Flow)
Uniform + Source/Sink Flow (Incompressible Potential Flow)
Просмотров 9 тыс.4 года назад
Uniform Source/Sink Flow (Incompressible Potential Flow)
Source/Sink Flow (Incompressible Potential Flow)
Просмотров 9 тыс.4 года назад
Source/Sink Flow (Incompressible Potential Flow)
Uniform Flow (Incompressible Potential Flow)
Просмотров 5 тыс.4 года назад
Uniform Flow (Incompressible Potential Flow)
thanks man
sorry if this is a silly question but why is the d not squared for dphi/dydz and all the others?
I got lost after good morning everyone
I saw your video repeatedly, and thank you for this Gold Mine, I have a question when I go to the steps on making that loaded file to be deleted on the Matlab code the comment "% Delete files if they exist" and "delete(saveFlnmAF); " parts, when I uncomment it and click RUN it is saying to error "Warning: File 'Save_Airfoil.txt' not found. > In MATLAB_XFOIL (line 52) Undefined variable 'dataBuffer'. Error in MATLAB_XFOIL (line 55) XB = dataBuffer{1}(:,1); % Boundary point X-coordinate >> What should I do, I watched your video for the 5th time today and I can't see any difference that I am making to get this kind of error, and anyone who can help, Please
Thank you This Video helped me with my University Exam🙂.
I love how this guy just deduces that everybody that is curious enough to watch his videos must be a skilled matematician, capable of easily solving the last equation. He spent 7 minutes explaining how to formulate the damn equation then he just shows the result without even showing the process...
Talking fast is most of the time a sign of insecurity and not helpfull if you want transfer information.
Hii what kind of engineer are you?
Literally the perfect instructional video.
You saved my IB MATH HL IA, thank you so much really clear and straight to the point
Is there any intuitive analogy that Cp and Cv that we can relate this to in real life? So abstract.
Nice and simple explanation for something so complicated.
Thank you so much for sharing valubale information :)
Amazing video. I have a quick question, if you have the time. What is the minimum temperature difference that can be shown in this setup? Can heat rising from a human body be shown like this? Thanks very much.
one of the most harsh topic i have ever seen in engineering.
This is brilliant! I finished college many years ago, but I still use notebooks for notes on books I'm reading so I won't forget. I've made "cheat" sheets for my son, who is dyslexic, on books he has to read for school with characters' names, settings, events, maps, and pictures. Grid notebooks are my favorite.
Hey, do you (or anyone else) still know where i could find a viable source for the equation?
Thanks good video
I like how you get to the point immediately. The inclusion of the diffuser makes sense but is also kinda counterintuitive. The afterburners are there to increase the velocity of the gases but to utilize them optimally we need to slow down the gasses first. I imagine that tuning the diffusers must be quite a challenge. To have a design that results in the maximal net velocity gain.
This explanation really helped me.
Thanks...it's a really nice video..
josh i cannot hear you no one can
That's a nice system, I'm going to change to that system! Thanks !!!
this video helped me. thanks to the teacher
Thank you! I was wondering how to do this until I saw your video. 👍
The way you organise the tutorial and the board is so fascinating Thanks alot
Hi Josh, excellent video and I have learned a lot. I have a question where if the default location of the thickness is not 30% of chord but at 23% of chord, what is the thickness distribution equation? Thank you.
What if it is a wood log
How can we run parallel simulations? I tried but having problems here. Thanks for this tutorial
Great video, sir! Thank you very much ❤❤
Is this theory basically what Whittle came up with in his senior thesis?
Hi Josh. Do you have a good reference for pulsed supersonic valve?
you saved lives
cool!. what kind of filament did you use?
you make an awesome professor. thank you
How do the bags survive the blasting engines long enough to do any kind of job?
You are a legend
Life Saver!
What the 🤯
Thank you so much for such detailed video and explanation. I understood thoroughly. 😊
Can you speak a bit quicker please!
thanks for this video!! awesome!!! here my some more ideas, we can do this discrete data integration using sum(udx+vdy), capture the variables along the circle and just do the summation!!
I like your funny words magic man
I'm in Aerosapce Engineering, having a hard time wrapping my head around these shock wave formulas. How do they take into account an aerodynamic or bluff body, for example? Say if we needed to calculate those ratios at different stations around an airplane fuselage, in an engine with an aerospike, a hyperloop train, etc?
Brilliant video! Goes down to the real fundamentals of meshing.
Wow, very nice and informative video!!
It seems to me that for a symmetrical airfoil, you can get a surprisingly decent approximation with a half ellipse ending at 30% chord, then a tangent circle arc to hit the trailing edge at the centerline (not perfect, but close enough if you just need to draw a visual aid rather than plotting the airfoi). I wonder if the equations simply to something similar, or if it's pure coincidence
How much horsepower does a 2016 Challenger Hellcat At .356 drag coefficient at sea level (Kennedy Space Center) need to go 215mph? Will 1000whp get me there with proper drive ratio?
Excellent tutorial, thanks for the video!
kralsın be josh