Computational Science Questions, Problems & Solutions : TransWikia.com ~ Page 31

System of second order ODEs Runge Kutta 4th order

I have two masses, and two springs which are atattched to a wall on one end. For context I attached the system of equations....

Asked on 01/30/2021 by J Wright

1 answer

Are there open-source scientific libraries which use modern Fortran with OOP?

I've spent the last couple of months on coding a Fortran program for solving a particular PDE system (describes fluid flow/combustion). I tryed to use latest-standard Fortran and the new...

Asked on 01/30/2021 by tiam

6 answer

What is Voronoi particle tracking?

I've been trying to track this down, but google is giving paywall papers that don't appear to be directly related to computational science, or simply don't explain the source algorithm....

Asked on 01/29/2021 by whn

1 answer

How are the classical set of equilibrium equations for linear elasticity derived?

In linear elasticity, the governing PDE is the equilibrium equations (absent of vibration considerations): $$-nabla cdot sigma = F$$ Is this equation simply derived from the sum...

Asked on 01/29/2021

3 answer

Using spline or piece wise function as input (intermediate) in Gekko

Simple paraphrase of my question is what is the best way to use a table or curve as an input for an optimization problem in Gekko (and/or AP Monitor)? For...

Asked on 01/28/2021 by nomad

1 answer

How to determine guitar tones played as early as possible?

I want to detect chords on a guitar as early as possible, but my approach with a sliding window and a filter bank seems to introduce too much lag. Would...

Asked on 01/26/2021

2 answer

Is there a minimum angle requirement for cells in the finite volume method?

In his talk "What is a good linear finite element?", Shewchuk states that small dihedral angles in linear tetrahedra elements cause ill-conditioning of the stiffness matrix. Do small...

Asked on 01/22/2021 by J. Heller

3 answer

Solving block band Toeplitz system

I wish to solve the system $T.X=Y$ where is block band Toeplitz and the unkown. In my case, has a particular form: the blocks are symmetric...

Asked on 01/21/2021 by DgSl

0 answer

Optimization on the multinomial manifolds of stochastic non-square matrices

Thanks for note! So I have an optimization problem with simple form but the decision variable is a large-scale matrix. My problem is similar to a existing problem here...

Asked on 01/21/2021 by Hu jiaran

1 answer

Choosing appropriate timestep for FDTD and PIC algorithms

I'm doing some particle-in-cell (PIC) simulations of propagation of short pulses in plasmas with a widely used code. This code uses Yee's field solver. So, the timestep must be lower...

Asked on 01/21/2021 by apadana

0 answer

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