INITDATA

To define a transient simulation model properly, initial conditions must be provided for the quantities of interest. In MESHFREE, the initial condition is prescribed per material for each quantity by the following syntax: where $MatTag$ is the material tag, %ind_quantity% is the index of the quantity, and RightHandSideExpression is a (scalar) expression. Note:

• If the initial value of a quantity is not defined, this value is defaulted to 0.
• There are no checks, whether the initial value is reasonable or not. The user has to make sure to provide appropriate initial values. For example, if k-epsilon turbulence modeling is turned on, k and epsilon must be initialized to positive values.
• There are also no checks regarding consistency of the initial conditions to boundary conditions, e.g. at an inflow boundary. The user should provide initial values consistent to the boundary conditions. This holds especially for the velocity. If there are inconsistencies, then you might observe instabilities in the first couple of iterations.

Example 1: Define the initial temperature of material $Air$ to be 273.15 K in the simulation domain Example 2: Define the initial turbulence quantities of material $Air$ as constant positive values in the simulation domain