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**Content Feed**

How to deal these type of errors from pdepe? "Error in pdepe/pdeodes (line 359)"

Yes, in my example, the M-matrix was constant but the same idea applies if M is a function of x or the dependent variables. The ...

2 months ago | 0

How to deal these type of errors from pdepe? "Error in pdepe/pdeodes (line 359)"

pdepe does not accept a non-diagonal mass matrix. But often you can deal with this by calculating the inverse of the mass matrix...

2 months ago | 0

| accepted

Why does solving the heat equation with MATLAB (pdepe) yield a completely different result than the Heisler chart (analytical solution)?

I referred to section 5.5 of Bergman (the source of your pdf file) and wrote a function that computes the solution the Heisler c...

3 months ago | 0

Submitted

pde1dM

pde1dm is a 1D PDE solver that supports high order interpolation functions, coupled ODE and is compatible with pdepe input synta...

5 months ago | 2 downloads |

PDEPE: Unable to meet integration tolerances without reducing the step size below the smallest value allowed

I have occasionally seen similar problems with pdepe in the past. I have written a PDE solver that has input similar to pdepe...

10 months ago | 0

Solving a system a coupled ODE and PDE

The error message is caused by your definition of the ode function: function [dydt] = ode_syst2(t, Tg, Ts, Fig, Fis) The defin...

11 months ago | 0

Appropriate method for solving coupled pdes

Yes, although it is true that the documentation for pdepe describes it as a solver for parabolic systems, it can often obtain...

1 year ago | 2

| accepted

Solving PDEs with mass conservation

I don't know how to integrate the dependent variables using pdepe. However, I have written a PDE solver with an input syntax sim...

1 year ago | 0

| accepted

Pdepe: Spatial discretization has failed. Discretization supports only parabolic and elliptic equations, with flux term involving spatial derivative.

The boundary conditions for your second PDE are invalid. These should work: pl = [0; 0]; ql = [1; 1]; pr = [ur(1)-cAO; 0]; q...

1 year ago | 1

| accepted

A system of PDEs which have one PDE with a spatial variable fixed term, u(x0, t)

pdepe is not really designed to handle systems of coupled PDE and ODE. However, I have written a PDE solver for MATLAB that has ...

1 year ago | 0

| accepted

Spatial discretization has failed. Discretization supports only parabolic and elliptic equations, with flux term involving spatial derivative.

Your boundary conditions for u2 (q=0, p=0 at each end) are not valid. The second equation in your system (u2_t=...) is, in fact...

1 year ago | 0

| accepted

Gas-Solid Reaction Modeling with Random Pore Model. Pdepe: Spatial discretization has failed. Discretization supports only parabolic and elliptic equations, with flux term involving spatial derivative.

Your right-end boundary conditions are invalid. Possibly you want: pr=[ur(1)-1 0]'; qr =[0 1]' ;

1 year ago | 1

| accepted

How to define a step function as input BC in pdepe?

Here is the way you want to define such a BC: if(t>=50) pl = [ul(1);0]; else pl = [ul(1)-10;0]; end One thing you ha...

1 year ago | 0

PDE with time-dependent boundary conditions

I do not believe it is possible to solve this problem with pdepe. However I have written a one-dimensional PDE solver which i...

1 year ago | 0

| accepted

Problem about mixture of ode-pde

I have developed a PDE solver, pde1dM, that Ibelieve can solve your coupled PDE/ODE system. The solver runs in MATLAB and is s...

1 year ago | 1

| accepted

Solve heat equation with source term

T and m are referred to as dependent variables, not independent; x and t are the independent variables. This Example shows how t...

1 year ago | 0

| accepted

Unable to meet integration tolerances

Your equations have a fundamental error. Just calculate the "s" term along the length at the initial temperature and the problem...

1 year ago | 0

How to solve PDE problem

Your PDE can replaced by these two PDE which is a form acceptable to pdepe. However, pdepe, or in fact any numerical method,...

1 year ago | 1

| accepted

Solving second order PDE

The reason that pdepe imposes a boundary condition of the flux equal zero at the center is that this is required for the proble...

1 year ago | 0

| accepted

PDEPE: Unable to meet integration tolerances without reducing the step size below the smallest value allowed at time t.

You are trying to solve a system of ODE which is something pdepe is not designed for. Specifically, the pdepe documentation says...

1 year ago | 0

| accepted

1D Fourier equation with temperature dependent thermal properties

function [c,f,s] = pdex1pde(x,t,T,dudx,diffr,Tfront) diffr=3.34E-10*T^4 - 9.37E-07*T^3 + 9.38E-04*T^2 - 4.80E-01*T + 2.09E+02; ...

1 year ago | 0

how can I code a system of 2 pdes and an ode for modelling a packed bed

I did some experimentation with your code. Here are a couple of comments related to the changes I made: Because the equations a...

1 year ago | 0

PDE system - pdepe system example - error or incomplete description on Matlab website?

Looks like you have found an error in this documentation page. If you look at equation 3 in the referenced paper you will see th...

2 years ago | 0

| accepted

Pdepe: Spatial discretization has failed. Discretization supports only parabolic and elliptic equations, with flux term involving spatial derivative.

Your boundary conditions (BC) are specified incorrectly; a qr(i) value of zero and pr(i)=constant is not a valid BC. Since you ...

2 years ago | 0

| accepted

PDEPE: Unable to meet integration tolerances for large values of Ra

The convergence problem you are seeing is due to the strong boundary layer effect near , i.e. the solution is undergoing a shar...

2 years ago | 0

How to define stepchanges, variable BC for different timeintervalls using pdepe?

The reason that your code didn't show a change in the BC with time is due to the programming error that Torsten pointed out. If ...

2 years ago | 1

| accepted

Euler-Bernoulli's beam ODE or PDE

Take a look at this example: beam dynamics with pdepe

3 years ago | 0

| accepted

Solving advection diffusion pde

The only problem I see with your code is in the boundary conditions. I corrected your bcfun function and have attached my versio...

3 years ago | 1

Moving boundary problem with Stefan condition (modeling mass and heat transfer for sublimation front)

I think you may be able to solve this problem using the |pdepe| function. The idea is that you model both phases as a single re...

3 years ago | 0

Error using pdepe - Spatial discretization has failed. Discretization supports only parabolic and elliptic equations, with flux term involving spatial derivative.

The fundamental cause of your problem is that your initial conditions are inconsistent with your boundary condition at |x=0|. M...

3 years ago | 0

| accepted