This can be a general thread that others may discuss their experiences. I have a question to which I couldn't readily find an answer:
What does it mean when the editor(in-chief, if it makes a difference) sends you papers to review often, like once a month? The editor even sends that person two...
Hello, I have a general question for the flows of steel-making up to the casting process.
Is the general flow depicted by the image correct? This specific process relies on natural gas reforming to produce H2, which is then used to reduce iron ore. Are there any corrections that I have to make?
What does it mean when a journal constantly changes managing editors for a revised submission?
A journal initially handed down a minor revision for a paper. I became a reviewer after the revision was complete, and saw many shortcomings or mistakes, so I recommended a major revision. It's been a...
I couldn't fit it in the title, but I think the merger of engineering and economics is going to be important going forward. I feel most economists look down on engineering economics (just thinking of variable/fixed operational costs and investment costs, etc), and most engineers think that...
The international Journal of Greenhouse Gas Control.
It has an Impact Factor of around 4, but what's the perception? Is it respected? Is it considered a good journal?
There isn't a qualitative judgment online. My boss seems to look down on it, but it has a good impact factor.
Hi, it is easy solving these PDEs with the idealized homogeneous BCs they throw out in class, but I am having some difficulty solving the transient problem posed in the images below. I have tried working through it, but I don't have confidence in the result. I overlook the solution when the...
Hi,
I've been having some difficulty with Matlab. I keep getting confused with the indexing and the loops.
To set up the code, I am trying to implement the ADI method for a 2-D heat equation (u_t=u_xx+u_yy+f(x,y,t)). I have Dirichlet boundary conditions on the left, upper, and lower...
I need to find the circulation for a flow in a pipe. I'm using the velocity in the angular direction (cylindrical coordinate system).
Am I right in thinking that an ideal vortex is one where there is no vorticity? That would mean there is no circulation. It's strange, because the velocity is...
I'm not sure if my thought process is correct. I basically looked at 1-D and 2-D self-adjoint problems to see what conditions were imposed on them, and tried to translate over to this problem.
Can somebody tell me if I'm correct? Or at least have the right idea?
I have my work linked below to...
I have a general question about index notation.
For an arbitrary quantity, a,
"a" denotes a scalar quantity.
"a_i" denotes a vector.
"a_ij" denotes a 2nd-order tensor.
So, if I have something like "a_i*e_ij*b_j"
Would this be like multiplying an nx1 vector, an mxm matrix, and an Lx1 vector...
I am solving a coupled system of non-linear PDE's.
What am I doing wrong in the procedure? It says, "Error, (in pdsolve/sys) too many arguments; some or all of the following are wrong: [[k(x, y), p(x, y)], {diff(k(x, y), y) = 0, diff(p(x, y), y) = 0}]". I am trying to imposed zero boundary...
I'm working on a project with a professor for my MS. It's computational, and I am currently stuck at a critical point. I can physically justify some assumptions and get the model to work, but I can't do so mathematically. They would be mathematically arbitrary.
I'm working to resolve this...
I'm working out some problems, and I'm ending up with a term similar to the following:
du/d(y/u)
I'm differentiating with respect to y/u. Both y and u are variables. How can I divide that up to represent differentiation with just one variable (Even if it means expanding the term)?
Is it...
Hello,
I'm thinking about a natural convection problem where you have turbulent flow on a vertical wall. It's compressible flow, and it's a two-phase problem. You have two boundary layers, one for the air-vapor mixture, and one for the condensate.
The question I'm pondering is this...
We're not talking very small. Is it the compiler? I'm using gfortran.
An example would be:
f(y)=1E-5*(y**3)
For f(40), that should be 0.64. When I compile and execute, however, it displays 0's.
If I make the coefficient 1, the result does come out to be correct.
I have an old...
Homework Statement
How do I set a slope-matching condition in COMSOL?
Homework Equations
u1x=u2x.
The Attempt at a Solution
I have used the Dirichlet BC type. I have multiplied and divided by n, the number of equations, on either side of the boundary.
I'm going to take a finite difference linear and non-linear PDE course next semester. I'm wondering how enjoyable the material is, and how difficult it may be. I'm actually looking forward to the fact there may only be one test throughout the semester, if any, and it's a mid-term. The rest of...
I'm new to this language, and my programming experience is limited (I've only done Assembly). My issues do not necessarily lie in the coding itself, but in the compiling and building.
I'm using Eclipse, on which I installed Photran. The syntax recognition and formatting of the GUI is very...
Hello,
This is the first time I'm using COMSOL on a problem where I have multiple subdomains within the domain. Previously, I have only been using one domain/one set of equations/Two global sets of BC's.
I've been having a hard time thinking of a solution to my problem.
I have 3...
Homework Statement
I have an empirically-derived equation for the shear stress of a fluid on a surface, given by the equation below.
I am supposed to take the derivative of density with respect to distance, and I must use this equation to find an expression for density.
Delta = Boundary...
Homework Statement
I am trying to integrate the momentum equation in the Navier-Stokes equations, and I need to make sure I have the density formulation correct. I'm unsure of my work because a lot of the terms in the end are canceling out.
It's a two-phase mixture, so the sum of the partial...
Hello,
I have a really complex function to integrate (not homework), and I was wondering if there is any software application that can handle it.
I have tried MathCAD and Maple, but both can't perform it. I don't think I can do it by hand, with all the integration by parts and expansions...
Hello,
I am in the process of showing that the modified Bessel function, I_v(x), is a solution to the modified Bessel equation,
x^2*y''+x*y'-(x^2+v^2)*y=0
I have differentiated the MBF twice and plugged it in to show that the left hand side is in fact 0.
After a good amount of work...
Mass is the product of density and volume.
Mass flow rate is the product density, velocity, and cross-sectional area. (It's the derivative of mass with respect to time.)
Bare with the syntax please...
Looking at a sphere within a larger sphere, the volume of the difference is...