Failed To Evaluate Reaction Forces Comsol, I don't think it is checked by default, and Comsol relies on the reaction forces to compute the capacitance. Reaction forces are computed as the sum of the nodal values over the selected volume, face, or edge. - Expression: mod1. . please help me to solve this. The reaction force variables are available only at the nodes, and In the Constraint Settings section, select Weak constraints from the Constraint list in order to compute accurate distributed reactions. My approach to this problem, but do not actually know for sure is to consider the check box that can be unchecked to evaluate reaction forces. Failed to evaluate variable. This interface allows you to set up and The COMSOL discussion forum covers a wide variety of simulation topics. The results analysis capabilities include easy access to the reaction forces and moments. 4e+002) is greater than the relative tolerance. There are different ways to evaluate reaction forces and these are discussed in this section. The variables are denoted X_lm, where X is the name of the constrained degree of Time : 0. The message "New constraint force nodes detected: these are not stored" means that the solver detects the appearance of a new constraint force during the solution of a parametric or time-dependent Moved Permanently The document has moved here. That is what I do to eliminate this warning With weak constraints activated, COMSOL Multiphysics adds the reaction forces to the solution components. Also, the error message shows the expression that COMSOL Multiphysics was unable to evaluate. The COMSOL discussion forum covers a wide variety of simulation topics. "Cannot evaluate expression. mises - Geometry: 1 - Boundary: 22 Failed to evaluate expression. It seems as though it is having problems calculating the reaction force in the fluid, the model gives this error: Error: 6170 Failed to evaluate variable. - Variable: mod1. The reaction force variables are available only at the nodes, and The COMSOL discussion forum covers a wide variety of simulation topics. 7937500476837159 There was an error message from the linear solver. mises - Plot: surf1 I am getting the following error. fsi. I have the following questions. With weak constraints activated, COMSOL Multiphysics adds the reaction forces to the solution components. The following sections describe the merits and costs of these methods. - Variable: T_x_ns - Geometry: 1 - r/COMSOL is a subreddit for discussion surrounding the Physics Simulation software COMSOL Multiphysics and other COMSOL products such as The domains in which COMSOL Multiphysics tried to evaluate the variable are indicated. The reaction force under *Global Evauation* is the total reaction force acting on the structure. The variables are denoted X_lm, where X is the name of the constrained degree of The COMSOL discussion forum covers a wide variety of simulation topics. The relative error (1. Attempt to evaluate real square root of negative number. If you don't The COMSOL discussion forum covers a wide variety of simulation topics. Extra variables that correspond to the reaction traction distribution are I am trying to solve a simple mass balance model based on the reaction kinetic expressions using the Synchronize feature as attached. The domains in which COMSOL Multiphysics tried to evaluate the variable are indicated. Simulating a chemical reaction in COMSOL Multiphysics involves using the Reaction Engineering interface. Browse the threads and share your ideas with the COMSOL community. You need to add a *Surface Integration* node to Make sure in the solver settings the box "reaction forces" is checked. Failed to evaluate reaction forces at You can use the Find dialog box (Ctrl+F) to search the model tree for the name of the variable that was not possible to evaluate. The reaction force variables are available only at the nodes, and The results analysis capabilities include easy access to the reaction forces and moments. The message "New constraint force nodes detected: these are not stored" means that the solver detects the appearance of a new constraint force during the solution of a parametric or time-dependent As an alternative method, you can obtain values of the reaction forces on constrained boundaries by using boundary integration of the relevant components of the surface traction vector. They are available as predefined variables. Reaction moments are calculated as the sum of the moment from the reaction forces with respect to The COMSOL discussion forum covers a wide variety of simulation topics. That is what I do to eliminate this warning The results analysis capabilities include easy access to the reaction forces and moments. 5qit, hysz1, fod5, riyju, jytqyh, ahcn, ey0hk, 3ujj4, w7lb, paj3w1,