Error happens when 'scheme' and 'SCheme' are added in fvm::div()

HectorLee · May 8, 2018, 11:15

Hello, everyone,

I am trying to simulate transport phenomena in two-phase flow and find a piece of source code for solving the advection-diffusion equation with the interface. For divergence part, it is written as:

fvm::div(phi, C, scheme) - fvm::div(phiD, C, CScheme)

After compiling the code, I got "error: ‘CScheme’ was not declared in this scope" and "error: 'scheme’ was not declared in this scope."

Although I searched solution using google, no solution is found. Is there anyone knowing how to fix this error? Thanks a lot.

Cyp · May 10, 2018, 21:45

The compilation error sounds pretty clear to me: the variables scheme and Cscheme you are using as arguments to construct your matrix from the function fvm::div() are not declared.

There are two ways for solving your problem:

1: you don't call the fonction with three arguments but only two (the third one is optional)

Code:

fvm::div(phi, C) - fvm::div(phiD, C)

You will have to specify the discretization scheme for div(phi,C) and div(phiD,C) in system/fvSchemes

2: you declare scheme and CScheme before calling your functions:

Code:

word scheme    "div(phi,C)";
word CScheme "div(phiD,C)";

...

fvm::div(phi, C, scheme) - fvm::div(phiD, C, CScheme)

HectorLee · May 15, 2018, 00:46

Thank you very much for your help, Cyprien. Sorry for replying you late, because I was in travel these days. I will try both methods later.

May 8, 2018, 11:15	Error happens when 'scheme' and 'CSheme' are added in fvm::div()	#1
HectorLee New Member Pei Li Join Date: Nov 2015 Posts: 10 Rep Power: 10	Hello, everyone, I am trying to simulate transport phenomena in two-phase flow and find a piece of source code for solving the advection-diffusion equation with the interface. For divergence part, it is written as: fvm::div(phi, C, scheme) - fvm::div(phiD, C, CScheme) After compiling the code, I got "error: ‘CScheme’ was not declared in this scope" and "error: 'scheme’ was not declared in this scope." Although I searched solution using google, no solution is found. Is there anyone knowing how to fix this error? Thanks a lot. Last edited by HectorLee; May 8, 2018 at 16:58.

May 10, 2018, 21:45		#2
Cyp Senior Member Cyprien Join Date: Feb 2010 Location: Stanford University Posts: 299 Rep Power: 18	The compilation error sounds pretty clear to me: the variables scheme and Cscheme you are using as arguments to construct your matrix from the function fvm::div() are not declared. There are two ways for solving your problem: 1: you don't call the fonction with three arguments but only two (the third one is optional) Code: fvm::div(phi, C) - fvm::div(phiD, C) You will have to specify the discretization scheme for div(phi,C) and div(phiD,C) in system/fvSchemes 2: you declare scheme and CScheme before calling your functions: Code: word scheme "div(phi,C)"; word CScheme "div(phiD,C)"; ... fvm::div(phi, C, scheme) - fvm::div(phiD, C, CScheme) hjasak and HectorLee like this. Last edited by Cyp; May 11, 2018 at 08:00.

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May 15, 2018, 00:46		#3
HectorLee New Member Pei Li Join Date: Nov 2015 Posts: 10 Rep Power: 10	Thank you very much for your help, Cyprien. Sorry for replying you late, because I was in travel these days. I will try both methods later.