[cyrusIII]

In computational methods why are the implicit analyses, more sensitive to numerical roundoff than explicit analyses? Would you give an example?

[FMDenaro]

Originally Posted by cyrusIII

In computational methods why are the implicit analyses, more sensitive to numerical roundoff than explicit analyses? Would you give an example?

What do you mean for "analyses"?

[cyrusIII]

Originally Posted by FMDenaro

What do you mean for "analyses"?

I mean for example solving an equation (or sets of Equations ) in the analysis of a problem computationally for example in a software or code ?

[FMDenaro]

Originally Posted by cyrusIII

I mean for example solving an equation (or sets of Equations ) in the analysis of a problem computationally for example in a software or code ?

but in CFD the term implicit/explicit are often used to specify the type of discrete time-integration...

[cyrusIII]

Originally Posted by FMDenaro

but in CFD the term implicit/explicit are often used to specify the type of discrete time-integration...

I think I should learn the terminology in CFD. I remember in Numerical Methods that we were doing with MATLAB we were solving sets of ODEs and there were implicit and explicit methods for that. I think it is still the case in the CFD but maybe with another terminology or maybe its solver choose it automatically. Any thoughts?
By the way what is "discrete time-integration" you mentioned used for? Is it for transient problems? what are those types?

[FMDenaro]

Originally Posted by cyrusIII

I think I should learn the terminology in CFD. I remember in Numerical Methods that we were doing with MATLAB we were solving sets of ODEs and there were implicit and explicit methods for that. I think it is still the case in the CFD but maybe with another terminology or maybe its solver choose it automatically. Any thoughts?
By the way what is "discrete time-integration" you mentioned used for? Is it for transient problems? what are those types?

generally the transport equation appears somehow like:

d phi/ dt = .....

depending on the discretization (that is, discrete time integration), the way such equations are integrated in time by means of explicit or implicit methods denotes such nomenclature.

I strongly suggest to read some good textbooks of CFD

[cyrusIII]

Originally Posted by FMDenaro

generally the transport equation appears somehow like:

d phi/ dt = .....

depending on the discretization (that is, discrete time integration), the way such equations are integrated in time by means of explicit or implicit methods denotes such nomenclature.

I strongly suggest to read some good textbooks of CFD

Thank you for the explanations.
What are the good textbooks you suggest for CFD?
One of my problems even in Solid mechanics is that articles get confusing and they do not follow the same standards and symbols etc. Some of them have continuum mechanics symbols some others chemical engineers etc. (diffusion, concentration, density etc) The reason why I said so is that I prefer articles because when I read textbooks and then I read articles they look totally different symbols and nomenclature etc which makes me frustrated and confused.

Are you a chemical Engineer or Mechanical?

[FMDenaro]

you can find in cfd-online the guide to CFD books, there are many good textbooks to start with...
for example see http://cfd2012.com/cfd-book-reviews.html

articles in scientific journals are only for advanced topics and I do not reccomend it for a learner


PS: I am an Aerospace Engineering and teach CFD at the university

[cyrusIII]

Originally Posted by FMDenaro

you can find in cfd-online the guide to CFD books, there are many good textbooks to start with...
for example see http://cfd2012.com/cfd-book-reviews.html

articles in scientific journals are only for advanced topics and I do not reccomend it for a learner


PS: I am an Aerospace Engineering and teach CFD at the university

Thank you for the list of books, it was helpful, I could guess you are a professor based on your style of responses I totally forgot Aerospace Engineering also major users of CFD.
Other than Engin and the airfoil and also the whole body of the plane modeling , simulation, and analysis, what other modelings or projects usually you guys do? I just try to increase my perception of CFD.

[FMDenaro]

Actually, any field where fluid dynamics appears ...