#Heaviside function comsol 5.3 software#
#Heaviside function comsol 5.3 license#

bi-directional flow would occur if the fluid cavity was smaller than the rock sample. where T 1 is the temperature where the phase change begins, T 2 is the temperature where it ends, and flc2hs is a smoothed Heaviside function used in COMSOL. But this will only work for unidirectional flow patterns and not bi-directional flow patterns. The Heaviside step function, or the unit step function, usually denoted by H or, is a step function, named after Oliver Heaviside, the value of which is zero for negative arguments and one for. mesh discretization and timestep control. DrainFlow avoids this risk by replacing the Heaviside function Hv(x) with a smoothed Heaviside function, in this case utilising the logistic function (Balakrishnan, 2013) (26) L o g i s t i c (x, e r r) (1 + exp ( x e r r)) 1 where err is the specified smoothing factor.

I realize that this can be solved with brute force, i.e. However, the cooling abilities of heat exchangers designed by traditional design methods is limited even if the geometric parameters are optimized at the same time. I noticed that the pressure oscillates when being solved and realize that this is a stability problem (a numerical abberation) which generates a negative pulse wave and a sudden drop inside the fluid cavity at the first timestep. In recent years, in order to obtain a radiator with strong heat exchange capacity, researchers have proposed a lot of heat exchangers to improve heat exchange capacity significantly. Hi everyone, I would like to define a heavy side function in comsol multiphysics (flc2hs) for the variable y giving as follows. the fluid is given an initial pressure of 1 (normalized) and the rock is maintained at 0 (t=0). The Heaviside step function has its particular definition. This is a pressure decay experiment, i.e. But after a while the droplet diameter is reduced and I think it is about the law of conservation of mass.While we want to have steady diameter of droplet and the only way to solve this problem is Heaviside function.

#Heaviside function comsol 5.3 software#

The permeabilities are 1e-22 and 1e-10, respectively. Actually we use Level set method in Comsol software for simulation of droplet moving in T-junction microchannel. The Structural Mechanics Module provided the basis for the nonlinear elastic part of the model. Finite element models were developed using the commercial software Comsol Multiphysics (v 3.5 Comsol AB, Burlington, MA).

There are two subdomains namely rock and fluid. in which H s is a smoothed Heaviside step function defined in the region x f x L.

#Heaviside function comsol 5.3 license#

12 make sure you know which license type you have before proceeding with the installation. COMSOL Multiphysics 5.3a but also to any of the add-on products, as well as COMSOL Server 5.3a and its add-ons. My model is composed of a transient, Darcy flow (pressure) problem. External function C compiler COMSOL API when used with Java. I am having a technical problem with the heaviside step function in COMSOL.