Hello, I hope someone here is able to help give me a definitive answer to my queries. Fluent 14.5 has support for utilizing a supported NVIDIA GPUs to off-load some computation tasks from the CPU with an HPC License (which my institution has). What is not clear from the literature I've read is...
I played around with the example file kindly provided by JohnRBaker (thank you!). I changed the law function because that in the example has a constant pitch between loops, i.e. an Archimedean rather than a logarithmic spiral (e.g. nautilis shell, hurricanes, etc.) that whose pitch get...
John, that appears to be it, thank you!! I'm trying to understand how you created it using a law spline (unexpected, but makes sense with the benefit of hindsight).
I'm reading up some more on the logarithmic spiral function. Seems there are a couple of different forms in cartesian...
Hello all,
I hope someone will be able to help me with this. I want to create a parametric curve of a 2D logarithmic spiral, ultimately to create an extruded body out of it.
The equation of this curve is given by:
In polar coordinates:
r = a*e^(b*theta)
or
theta = (1/b)*ln(r/a)...
BrianPetersen wrote: Regarding cam timing effects, a lot of the muscle-car engines back in the day, and sport motorcycle engines nowadays, get away with 13:1-ish nominal compression ratio simply because they are running so much cam that at lower revs, the volumetric efficiency is lower, so there...
Retarded IVC need not experience a loss in performance (at least compared in magnitude to having to drop x PSI of boost and y degrees of ignition timing on account of knocking). If the intake is properly tuned, the charge backflow from late IVC can be minimized or eliminated where an...
A couple of things you can try to mitigate knock before opening the engine up to reduce the CR. First, 11.6 AFR is extremely rich; that's equivalent to about Lambda 0.79 on gasoline. Further, I assume that you are calculating AFR based on gasoline only. Methanol has a very different...
Franz, I'm using GDI Injectors but placing them in the intake ports... I thought this was amply clear. We're thinking outside the box, this is not for a passenger car engine application.
Draw a P-v diagram and you will see how expansion is longer than compression (the latter of which is to include the pre-expansion), which is the intent of the Atkinson -- and Miller -- cycle. Better, find the MTZ article I cited; it will even illustrate the P-v diagram for you.
In the above reference, the authors use EIVC as Miller and LIVC as Atkinson. Mazda uses the term Miller to denote LIVC with supercharging; Toyota uses Atkinson to denote LIVC in the naturally aspirated Prius engine. You can see that there's no real agreement on the nomenclature convention. A...
