Recent content by hoomanya

Hi, I am trying to work out how much each dimension of a solid (for instance an annular disc) made out of steel changes assuming that the solid is heated uniformly and is not constrained at any of its boundaries. Am I right in saying that, the linear expansion equation L = L_0 (1+ α ΔT) can be...

Hi again, am I right that s(T) is a valid assumption for most liquids and solid because the intermolacular spacing is constant and hence changes in entropy due to changes in specific volume can be ignored?

Hi, is there a way to add a user defined convergence criteria to an ode solver so that the solution is stopped?

Hi, Am I right in saying that if the gradient of displacement is negative then stress is negative as in a simple elastic case, sigma = E*du/dx? thanks.

thanks very much for your help this far.

I was thinking of the fundamental equation of thermodynamics and how Tds = du - pdv and so changes in the internal energy could be due to pdv or Tds independently. Can the changes in internal energy therefore no be just due the changes in pdv?

My fluid is water. How about liquids?

Thanks very much. By strong or weak, do you mean in terms of speed of propagation of the wave? Also does this statement make sense "I read somewhere that the isothermal conditions could be explained by the waves having enough time to exchange heat and maintain a constant T"? Thanks again.

Hi, I'm trying to make sense of a wave propagation problem. It's a 1D problem, modelling propagation of density perturbations which travel like waves in a fluid. The problem is governed by the mass and momentum equations and density is related to pressure using the bulk modulus of the fluid...

Hi, so I had a think about what you said, and in the problem essentially, sound waves propagate as a result of interplay between density and pressure. Essentially, I think the rare-fractions and the compressions have enough time to exchange heat and maintain at a constant temperature depending...

Can someone please help with hyperelastic theory, I need to know how changes in reversible work are related to energy density function and then to strain and stress tensors. A reference that explains the theories simply would also be appreciated. So far I have failed to find anything relatively...

Hi, is displacement gradient du/dx same as strain? i though it would be until someone made a comment that they are not the same thing and now I am confused.

I am solving the isothermal Euler equations and relating pressure to density using the bulk modulus of the material. I have an initial density (and hence pressure) wave and initial velocity is zero.

I'm not sure what you mean by a continuum model. I am not using a differential energy balance equation.

That's what I thought. I might be reading the text I am reading wrong as the equations are not labelled correctly. Thanks. Good to know something else might be the problem.